CBSE 11th Chemistry Structure Of Atom Chapter Case Study Question with Answers - by users_admin - Jan 22, 2024 - View & Read

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CBSE 11th Standard Chemistry Subject Structure of Atom Value Based Questions 5 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Wilhelm Rontgen showed that when electrons strike a material in the cathode ray tube, some rays are originated that can cause fluorescence in the fluorescent material placed outside the cathode ray tubes. He named these rays as X-rays as these were not deflected by electric and magnetic field. X-rays are used as a diagnostic tool in the treatment of disease and bone fracture. An intelligence officer, John catched a smuggler by using this X-ray machine. He was trying to smuggle the drugs while travelling abroad.
  (a) Why are X-rays used at airport to screen luggage?
  (b) Why are only X-ray choosed to screen the luggage?
  (c) What values are not possessed by John? What measures should be taken to prevent this?

• 2)

  Sheela was a student. One day, she saw that rainbow appears in the sky after raining. Another day, when she was drying her hairs in sunlight, she found the same combination of colour, by watching the sunlight through her hairs. She was very surprised but confused also. She asked about this from her science teacher who satisfied her by telling about the composition of light (white light) and its splitting into different colours when passed through different medium.
  (a) Give the composition of white light?
  (b) Can you guess why she saw a phenomenon similar to formation of rainbow when light passed through her hair?
  (c) Applying Bohr's model when electrons in H-atom comes from n = 4 to n = 2, m calculate the wavelength of the line.
  \(\left( { R }_{ H }=2.18\times { 10 }^{ -18 }J, \ h=6.63\times { 10 }^{ -34 }J \right) \).
  (d) What values are associated with Sheela's teacher?

CBSE 11th Standard Chemistry Subject Structure of Atom Value Based Questions 5 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Raman and Sonu were friends. They both are student's of class XI. Many times Raman helped Sonu in his studies. One day, when they were discussing about electronic configuration, Raman told Sonu that writing electronic configuration is very important as this helps in knowing why the substances present around us differ from each other like water flows but salt or ice does not? How can we improve their properties and make them more useful? He also told Sonu that while writing electronic configuration, always follow, Pauli's principle, Hund's rule and Aufbau principle. After that the discussion, Sonu found this topic very easy.
  (a) Write the electronic configuration of Na and Ar.
  (b) What is the valency of Na and Ar elements?
  (c) How can one predict the nature of compound with help of electronic configuration?
  (d) What values are shown by Raman?

CBSE 11th Standard Chemistry Subject Environmental Chemistry Value Based Questions 3 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Dr Jain's family has four cars and they use all of them everyday creating lot of pollution whereas Mr. Lalit Jain despite having two cars, takes metro or other means of public transport to reach his place of work.
  (i) What kind of polluting gases are emitted by motor vehicles?
  (ii) How can we decrease carbon monoxide gas in the atmosphere?
  (iii) What values are possessed by Mr. Lalit Jain?

• 2)

  Sonu and Nilesh were friends. In winters, one day when they were going to school at 10:00 am Sonu felt irritation in his eyes and throat. He was also unable to breath.
  Nilesh immediately took him to a doctor. Doctor gave him the proper remdy. When he became well, Nilesh asked reason for this Doctor answered him satisfactorily.
  (i) Can you guess what reason was given by the doctor for the illness of Sonu.
  (ii) Why such kind of polluting atmospheric change occurs?
  (iii) What should be done to prevent the formation of smog?
  (iv) What values are possessed by Nilesh?

• 3)

  Mr. Grover owner of a dry cleaning shop, was using terachloromethane eralier as a solvent for dry-cleaning. The compound containers the ground water and is also suspected carcinogenic. Mr. Raj owner of another dry cleaning shop is using CO ₂ these days.
  Hydrogen peroxide is being used for bleaching purpose.
  (i) What is the advantages of using liquid Co₂ with suitable detergent for dry-cleaning?
  (ii) What is the advantage of using H₂O₂ as bleaching agent?
  (iii) What values are possessed by Mr. Raj?

• 4)

  Water is essential for life and we cannot imagine our life without it. Municipal and Industrial discharge lead to water pollution. Organic wastes also create water pollution. Heavy metals from industries create lot of water pollution.
  Immersion of a statues of during festivals, create lot of water pollution.
  The residents of Chitranjan Park decided no to put Durga statue into Yamuna river like every year. This step was highly appreciated by Delhi Govternment, and the NGO 'Save Yamuna Project'.
  (i) What should be done to reduce water pollution? Give three ways.
  (ii) What is the effect of water pollution?
  (iii) What is the threat for aquatic animals due to water pollution?
  (iv) What values are possessed by the residents of Chitranjan Park?

CBSE 11th Standard Chemistry Subject Environmental Chemistry Value Based Questions 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  (i) State the Heisenberg's uncertainty principle.
  (ii) Write down the significance of Heisenberg principle.
  (iii) Do you think it has utility in your daily life? Justify your answer

• 2)

  (i) What is the basis of classification to the classification of modern periodic table?
  (ii) Can you apply the concept of periodic classification to the students in a class?
  (iii) What is the value associated with it?

• 3)

  Ionic compounds have high melting and boiling points. There is strong electrostatic force of attraction between them. Answer the following:
  (i) Why ionic solids are poor conductor of electricity?
  (ii) What happens to the electrical conductivity when they are dissolved in water?
  (iii) What is the value associated with it?

• 4)

  (i) What do you mean by diffusion?
  (ii) Ammonia and hydrochloric acid gases are prepared at the two extreme corners in the laboratory. Which gas will reach first to a person in the centre of the laboratory?
  (iii) Write down the value points

• 5)

  While working in laboratory a student kept ferrous sulphate in a vessel made up of zinc. After few days he found cracks in the container.
  (i) Why cracks were found in the container?
  (ii) Write down the chemical reaction takes place.
  (iii) What is the value associated with this?

CBSE 11th Standard Chemistry Subject Environmental Chemistry Value Based Questions 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  In our cities we face endless hours of power cut. How recycled waste can be useful in getting rid of this problem?

• 2)

  You came to know that in your village ponds and tanks are severely polluted. Being a student of chemistry how will you check the pollution level and as a responsible citizen what will you do for this problem?

• 3)

  In your opinion what measures will you take to save your valuable monument from acid rain?

• 4)

  How is green chemistry a revolutionary step in protecting our environment and society?

• 5)

  What is the use of recycled waste?

CBSE 11th Standard Chemistry Subject Value Based Questions 5 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Sheela was a student. One day, she saw that rainbow appears in the sky after raining. Another day, when she was drying her hairs in sunlight, she found the same combination of colour, by watching the sunlight through her hairs. She was very surprised but confused also. She asked about this from her science teacher who satisfied her by telling about the composition of light (white light) and its splitting into different colours when passed through different medium.
  (a) Give the composition of white light?
  (b) Can you guess why she saw a phenomenon similar to formation of rainbow when light passed through her hair?
  (c) Applying Bohr's model when electrons in H-atom comes from n = 4 to n = 2, m calculate the wavelength of the line.
  \(\left( { R }_{ H }=2.18\times { 10 }^{ -18 }J, \ h=6.63\times { 10 }^{ -34 }J \right) \).
  (d) What values are associated with Sheela's teacher?

• 2)

  Romi is a class XI student. One day he studied Heisenberg's uncertainty principle, according to which it is not possible to determine the exact position and velocity of a moving object simultaneously. But when he was watching car race, he found that it is possible to measure position and velocity of a car at any instance simultaneously. He got confused. He asked this to his father. His father clarified his doubt. From his answer, he got satisfied.
  (a) What thing is missing in the above given statement of Heisenberg's principle?
  (b) Can you guess the clarification given by Romi's father?
  (c) What values are exhibited by Romi and his father?

CBSE 11th Standard Chemistry Subject Value Based Questions 5 Mark Questions 2021 Part - II - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Wilhelm Rontgen showed that when electrons strike a material in the cathode ray tube, some rays are originated that can cause fluorescence in the fluorescent material placed outside the cathode ray tubes. He named these rays as X-rays as these were not deflected by electric and magnetic field. X-rays are used as a diagnostic tool in the treatment of disease and bone fracture. An intelligence officer, John catched a smuggler by using this X-ray machine. He was trying to smuggle the drugs while travelling abroad.
  (a) Why are X-rays used at airport to screen luggage?
  (b) Why are only X-ray choosed to screen the luggage?
  (c) What values are not possessed by John? What measures should be taken to prevent this?

CBSE 11th Standard Chemistry Subject Value Based Questions 5 Mark Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Romi is a class XI student. One day he studied Heisenberg's uncertainty principle, according to which it is not possible to determine the exact position and velocity of a moving object simultaneously. But when he was watching car race, he found that it is possible to measure position and velocity of a car at any instance simultaneously. He got confused. He asked this to his father. His father clarified his doubt. From his answer, he got satisfied.
  (a) What thing is missing in the above given statement of Heisenberg's principle?
  (b) Can you guess the clarification given by Romi's father?
  (c) What values are exhibited by Romi and his father?

CBSE 11th Standard Chemistry Subject Value Based Questions 3 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Dr Jain's family has four cars and they use all of them everyday creating lot of pollution whereas Mr. Lalit Jain despite having two cars, takes metro or other means of public transport to reach his place of work.
  (i) What kind of polluting gases are emitted by motor vehicles?
  (ii) How can we decrease carbon monoxide gas in the atmosphere?
  (iii) What values are possessed by Mr. Lalit Jain?

• 2)

  Sonu and Nilesh were friends. In winters, one day when they were going to school at 10:00 am Sonu felt irritation in his eyes and throat. He was also unable to breath.
  Nilesh immediately took him to a doctor. Doctor gave him the proper remdy. When he became well, Nilesh asked reason for this Doctor answered him satisfactorily.
  (i) Can you guess what reason was given by the doctor for the illness of Sonu.
  (ii) Why such kind of polluting atmospheric change occurs?
  (iii) What should be done to prevent the formation of smog?
  (iv) What values are possessed by Nilesh?

• 3)

  Mr. Grover owner of a dry cleaning shop, was using terachloromethane eralier as a solvent for dry-cleaning. The compound containers the ground water and is also suspected carcinogenic. Mr. Raj owner of another dry cleaning shop is using CO ₂ these days.
  Hydrogen peroxide is being used for bleaching purpose.
  (i) What is the advantages of using liquid Co₂ with suitable detergent for dry-cleaning?
  (ii) What is the advantage of using H₂O₂ as bleaching agent?
  (iii) What values are possessed by Mr. Raj?

• 4)

  Water is essential for life and we cannot imagine our life without it. Municipal and Industrial discharge lead to water pollution. Organic wastes also create water pollution. Heavy metals from industries create lot of water pollution.
  Immersion of a statues of during festivals, create lot of water pollution.
  The residents of Chitranjan Park decided no to put Durga statue into Yamuna river like every year. This step was highly appreciated by Delhi Govternment, and the NGO 'Save Yamuna Project'.
  (i) What should be done to reduce water pollution? Give three ways.
  (ii) What is the effect of water pollution?
  (iii) What is the threat for aquatic animals due to water pollution?
  (iv) What values are possessed by the residents of Chitranjan Park?

CBSE 11th Standard Chemistry Subject Value Based Questions 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  What do you mean by hydrogen economy? How can it be helpful for our society?

• 2)

  A student wants to verify the law of conservation of mass in laboratory. He prepared 10% aqueous solution of MgSO ₄ and MgCI₂. He mixed 10 ml of both in a beaker. He weighed the flask on a balance. After some time he weighed again. There was no change in mass. Answer the following questions given below:-
  (i) Was the student able to verify the law of conservation of mass? What was his mistake?
  (ii) What is the value associated with it?

• 3)

  (i) State the Heisenberg's uncertainty principle.
  (ii) Write down the significance of Heisenberg principle.
  (iii) Do you think it has utility in your daily life? Justify your answer

• 4)

  (i) What is the basis of classification to the classification of modern periodic table?
  (ii) Can you apply the concept of periodic classification to the students in a class?
  (iii) What is the value associated with it?

• 5)

  Ionic compounds have high melting and boiling points. There is strong electrostatic force of attraction between them. Answer the following:
  (i) Why ionic solids are poor conductor of electricity?
  (ii) What happens to the electrical conductivity when they are dissolved in water?
  (iii) What is the value associated with it?

CBSE 11th Standard Chemistry Subject Value Based Questions 2 Mark Questions 2021 Part - II - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  In our cities we face endless hours of power cut. How recycled waste can be useful in getting rid of this problem?

• 2)

  You came to know that in your village ponds and tanks are severely polluted. Being a student of chemistry how will you check the pollution level and as a responsible citizen what will you do for this problem?

• 3)

  In your opinion what measures will you take to save your valuable monument from acid rain?

• 4)

  How is green chemistry a revolutionary step in protecting our environment and society?

• 5)

  What is the use of recycled waste?

CBSE 11th Standard Chemistry Subject Value Based Questions 2 Mark Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 31, 2021 - View & Read

• 1)

  Wilhelm Rontgen showed that when electrons strike a material in the cathode ray tube, some rays are originated that can cause fluorescence in the fluorescent material placed outside the cathode ray tubes. He named these rays as X-rays as these were not deflected by electric and magnetic field. X-rays are used as a diagnostic tool in the treatment of disease and bone fracture. An intelligence officer, John catched a smuggler by using this X-ray machine. He was trying to smuggle the drugs while travelling abroad.
  The approximate wavelength of X-rays is ............

• 2)

  What do you mean by hydrogen economy? How can it be helpful for our society?

• 3)

  Ionic compounds have high melting and boiling points. There is strong electrostatic force of attraction between them. Answer the following:
  (i) Why ionic solids are poor conductor of electricity?
  (ii) What happens to the electrical conductivity when they are dissolved in water?
  (iii) What is the value associated with it?

• 4)

  (i) What do you mean by diffusion?
  (ii) Ammonia and hydrochloric acid gases are prepared at the two extreme corners in the laboratory. Which gas will reach first to a person in the centre of the laboratory?
  (iii) Write down the value points

• 5)

  While working in laboratory a student kept ferrous sulphate in a vessel made up of zinc. After few days he found cracks in the container.
  (i) Why cracks were found in the container?
  (ii) Write down the chemical reaction takes place.
  (iii) What is the value associated with this?

CBSE 11th Standard Chemistry Subject HOT Questions 5 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  If uncertainties in the measurement of position and momentum of an electron are found to be equal in magnitude, what is the uncertainty in the measurement of velocity of the electron? Comment on the result obtained?

• 2)

  Iron pieces are attracted towards a magnet but zinc pieces are not. Why?

• 3)

  Calculate the pH of 10^-8M HCl

• 4)

  An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write its reaction with \({ Al }_{ 2 }{ Cl }_{ 6 }\)

• 5)

  When the first element of the periodic table is treated with dioxygen, it gives a compound whose solid state floats on its liquid state. This compound has an ability to act as an acid as well as a base. What products will be formed when this compound undergoes auto ionisation?

CBSE 11th Standard Chemistry Subject HOT Questions 5 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  If uncertainties in the measurement of position and momentum of an electron are found to be equal in magnitude, what is the uncertainty in the measurement of velocity of the electron? Comment on the result obtained?

• 2)

  Iron pieces are attracted towards a magnet but zinc pieces are not. Why?

• 3)

  On a ship sailing in Pacific ocean where temperature is \(23.4^{ \circ }C\) , a balloon is filled with 2L air. What will be the volume of the balloon when the ship reaches Indian ocean, where temperature is  \(26.1^{ \circ }C\) ?

• 4)

  Calculate the pH of 10^-8M HCl

• 5)

  An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write its reaction with \({ Al }_{ 2 }{ Cl }_{ 6 }\)

CBSE 11th Standard Chemistry Subject HOT Questions 3 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  Prove that density of the nucleus is constant.

• 2)

  What is meant by the term bond order? Calculate the bond order of : N₂, O_2, O_{2 ⁺,} \({ O }_{ 2 }^{ - }\)

• 3)

  Indicate the type of bonds present in NH₄No₃ and state the mode of hybridisation of two N-atoms in it.

• 4)

  A man takes a diet equivalent to 10000 kJ per day and does work, in expending his energy in all forms equivalent to 12500 kJ per day. What is change in internal energy per day?If the energy lost was stored as sucrose (1632 kJ pre 100g), how many days should it take to lose 2kg of his weight?(Ignore water loss)

CBSE 11th Standard Chemistry Subject HOT Questions 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  Which of the following sets of orbitals are degenerate and why?
  (a) 1s, 2s and 3s in Mg - atom.
  (b) 2p_x, 2p_y and 2p_z in C-atom.
  (c) 3s, 3p_x and 3d - orbitals in H - atom.

• 2)

  Iron piece are attracted toward a magnet but zinc piece are not Why?

• 3)

  Indicate the type of bonds present in NH₄No₃ and state the mode of hybridisation of two N-atoms in it.

• 4)

  Density of a gas is found to be 5.46 g/dm³ at 27 C and 2 bar pressure. What will be its density at STP?
  Notes: STP mean at 1 bar and 273 K, so compare the density at 27\(^{o}\) C and 2 bar with density at STP by using the relation d = pM/RT

CBSE 11th Standard Chemistry Subject HOT Questions 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  In Rutherford’s experiment, generally the thin foil of heavy atoms, like gold, platinum etc. have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results ?

• 2)

  Aluminium forms the ion Al³⁺ , but not Al ⁴⁺  why?

• 3)

  Discuss the hybridisation of Be in gaseous state and solid state.

• 4)

  Use the information and data given below to answer the question, stronger intermolecular forces result in higher boiling point.
  Strength of London forces increases with the number of electrons in the molecules. Boiling point of HF, HCI, HBr, and HI are 293 K, 189 K, 206 K and 238 K respectively.
  Looking at the trend of boiling points of HCI, HBr, and HI, explain out of dipole-dipole interaction and London interaction, which one is predominant here.

• 5)

  Use the information and data given below to answer the question, stronger intermolecular forces result in higher boiling point.
  Strength of London forces increases with the number of electrons in the molecules. The boiling point of HF, HCI, HBr, and HI are 293 K, 189 K, 206 K and 238 K respectively.
  Why is the boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest?

CBSE 11th Standard Chemistry Subject HOT Questions 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  In Rutherford’s experiment, generally the thin foil of heavy atoms, like gold, platinum etc. have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results ?

• 2)

  Calculate the approximate charge in coulomb and approximate mass in kilogram of the nucleus of lithium 7 isotope.

• 3)

  Aluminium forms the ion Al³⁺ , but not Al ⁴⁺  why?

• 4)

  Explain why HF is less viscous than H₂O

• 5)

  Discuss the hybridisation of Be in gaseous state and solid state.

CBSE 11th Standard Chemistry Subject HOT Questions 1 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  How are \({ d }_{ xy }\ \)and   \(d{ x }^{ 2 }-{ y }^{ 2 }\) orbitals related?

• 2)

  Why is NaCl harder than sodium metal?

• 3)

  The experimentally determined N-F bond length in NF₃ is greater than the sum of the single covalent radii of n and F.

• 4)

  Why are the gases helium and hydrogen not liquefied at room temperature by applying very high pressure?

• 5)

  Under what condition, the heat evolved or absorbed in a reaction is equal to its free energy change?

CBSE 11th Standard Chemistry Subject HOT Questions 1 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 28, 2021 - View & Read

• 1)

  Neutrons can be found in all atomic nuclei except in one case. Which is this atomic nucleus and what does it consist of ?

• 2)

  Explain why uncertainty principle is significant only for the motion of sub-atomic particle but is negligible for the macroscopic objects?

• 3)

  Why AIF₃ is a high melting solid whereas SiF₄ is a gas?

• 4)

  How many nodal planes are present in  \(\pi ({ 2p }_{ x })\) and \( \pi{ \times}({ 2p }_{ x })\) molecular orbitals?

• 5)

  What would have happened to the gas if the molecular collision were not elastic?

CBSE 11th Standard Chemistry Subject Hydrogen Ncert Exemplar 5 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 27, 2021 - View & Read

• 1)

  A colourless liquid A contains H and O elements only. It decomposes slowly one exposure to light. It is stabilised by mixing urea to store in the presence of light. 
  (i) Suggest possible structure of A
  (ii) Write chemical equations for its decomposition reaction in the light.

• 2)

  An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write its reaction with \({ Al }_{ 2 }{ Cl }_{ 6 }\)

• 3)

  What mass of hydrogen peroxide will be present in 2L of a 5M solution?

• 4)

  Calculate the mass of oxygen which will be liberated by the decomposition of 200mL of this solution.

CBSE 11th Standard Chemistry Subject Redox Reactions Ncert Exemplar 5 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 27, 2021 - View & Read

• 1)

  Identify the redox reaction out of the following reactions and identify the oxidising and reducing in them.
  (i) 3HCl(aq) + HNO₃(aq) \(\longrightarrow \) Cl₂(g) +NOCl(g) + 2H₂O(l)
  (ii) \({ Hgcl }_{ 2 }(aq)+2KI(aq)\longrightarrow { HgI }_{ 2 }(s)+{ 2KCl(aq) }\)
  (iii) Fe₂O₃ (s) + 3CO(g) \(\overset { \Delta }{ \longrightarrow } \)2Fe(s) +3CO₂(g)
  (iv) PCl₃(l)+3H₂O(l)⟶3HCl(aq)+H₂PO₃(aq)
  (v) 4NH₃(aq) + 3O₂(g) \(\longrightarrow \) 2N₂(g) + 6H₂O(g)

• 2)

  In Ostwald's process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can be obtained starting only with 10.0 g of ammonia and 20.0 g of oxygen?

CBSE 11th Standard Chemistry Subject The p-block Elements Ncert Exemplar 3 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 27, 2021 - View & Read

• 1)

  Three pairs of compounds are given below, Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.
  AlCl₃, AlCl.

• 2)

  Three pairs of compounds are given below, Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.
  InCl₃, InCl

• 3)

  A tetravalent element forms monoxide and dioxide withoxygen. When air is passed over heated element(1273 K), Producer gas is obtained. Monoxide of the element is powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulas of its monoxide and dioxide.
  Write chemical equations for the formation of prodecur gas and reduction of ferric oxide with the monoxide.

• 4)

  Identify the compounds A, X and Z in the following reactions,
  \(A+2HCI+5{ H }_{ 2 }O\rightarrow 2NaCl+X\)
  \(X \ \xrightarrow [ \Delta ]{ 370K } HBO_{ 2 }\xrightarrow [ \Delta ]{ >370K } Z\)

• 5)

  Identify the compounds A, X and Z in the following reactions,
  \(Z+3LiAlH_{ 4 }\rightarrow X+3LiF+3AlF_{ 3 }\)
  \( X+6{ H }_{ 2 }O\rightarrow Y+6{ H }_{ 2 }\)
  \(X+3O_{ 2 }\underrightarrow { \Delta } B_{ 2 }O_{ 3 }+3{ H }_{ 2 }O\)

CBSE 11th Standard Chemistry Subject The p-block Elements Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 27, 2021 - View & Read

• 1)

  Explain the following.
  Gallium has higher ionisation enthalpy than aluminium.

• 2)

  Explain the following.
  Boron does not exist as B³⁺ion.

• 3)

  Explain the following.
  Aluminium forms [AlF₆]^3- ion but boron does not form [BF₆]^3-ion.

• 4)

  Three pairs of compounds are given below, Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.
  TlCl₃, TlCl

• 5)

  Three pairs of compounds are given below, Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.
  AlCl₃, AlCl.

CBSE 11th Standard Chemistry Subject Chemical Bonding and Molecular Structure Ncert Exemplar 3 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 27, 2021 - View & Read

• 1)

  Write lewis structure of the following compounds and show formal charge each atom.

• 2)

  Write the resonance structures for  NO₂

• 3)

  What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of  O - H bond in ethanol (C₂H₅OH) and water?

• 4)

  Give reasons for the following.
  Water molecule has bent structure whereas carbon dioxide molecule is linear.

• 5)

  Predict the hybridisation of each carbon in the molecule of organic compound given below. Also indicate the total number of \(\sigma \ and \ \pi \)-bonds in this molecule.
  

CBSE 11th Standard Chemistry Subject Chemical Bonding and Molecular Structure Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 27, 2021 - View & Read

• 1)

  Explain the non-linear shape of H₂S and non-planar shape of pcl₃ using valence shell electron pair repulsion theory.

• 2)

  Give reasons for the following. Covalent bonds are directional bond while ionic bonds are non-directional.

• 3)

  Give reasons for the following. Ethyne molecule is linear.

• 4)

  Which of these compounds has the highest dipole moment?

• 5)

  Write lewis structure of the following compounds and show formal charge each atom.

CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Consider structure I to VII and answer the following questions (i) and (ii).
  I. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ OH }\) 
  II. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad \quad { OH }\)  
  III. \({ \quad \quad \quad \quad CH }_{ 3 }\\ \quad \quad \quad \quad |\\ { { CH }_{ 3 } }-{ C }-{ CH }_{ 3 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { OH }\) 
  IV. \({ CH }_{ 3 }-{ CH }-{ CH_{ 2 } }-{ OH }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { CH }_{ 3 }\) 
  V. \({ CH }_{ 2 }-{ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 3 }\)
  VI. \({ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 }\) 
  VII. \({ CH }_{ 3 }-{ O }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad { CH }_{ 3 }\)  
  (i) Which of the above compounds form pairs of metamers?
  (ii) Identify the pairs of compounds which are functional group isomers.
  (iii) Identify the pairs of compounds that represent position isomerism.
  (iv) Identify the pairs of compounds that represent chain isomerism.

• 2)

  Consider structure I to VII and answer the following questions (i) and (ii).
  I. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ OH }\) 
  II. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad \quad { OH }\)  
  III. \({ \quad \quad \quad \quad CH }_{ 3 }\\ \quad \quad \quad \quad |\\ { { CH }_{ 3 } }-{ C }-{ CH }_{ 3 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { OH }\) 
  IV. \({ CH }_{ 3 }-{ CH }-{ CH_{ 2 } }-{ OH }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { CH }_{ 3 }\) 
  V. \({ CH }_{ 2 }-{ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 3 }\)
  VI. \({ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 }\) 
  VII. \({ CH }_{ 3 }-{ O }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad { CH }_{ 3 }\)   
  Identify the pairs of compound which are functional group isomers.

• 3)

  Consider structure I to VII and answer the following questions (i) and (ii).
  I. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ OH }\) 
  II. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad \quad { OH }\)  
  III. \({ \quad \quad \quad \quad CH }_{ 3 }\\ \quad \quad \quad \quad |\\ { { CH }_{ 3 } }-{ C }-{ CH }_{ 3 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { OH }\) 
  IV. \({ CH }_{ 3 }-{ CH }-{ CH_{ 2 } }-{ OH }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { CH }_{ 3 }\) 
  V. \({ CH }_{ 2 }-{ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 3 }\)
  VI. \({ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 }\) 
  VII. \({ CH }_{ 3 }-{ O }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad { CH }_{ 3 }\) 
  Identify the pairs of compounds that represent position isomerism.

• 4)

  Consider structure I to VII and answer the following questions (i) and (ii).
  I. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ OH }\) 
  II.
  \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad \quad { OH }\)  
  III.
  \({ \quad \quad \quad \quad CH }_{ 3 }\\ \quad \quad \quad \quad |\\ { { CH }_{ 3 } }-{ C }-{ CH }_{ 3 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { OH }\) 
  IV.
  \({ CH }_{ 3 }-{ CH }-{ CH_{ 2 } }-{ OH }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { CH }_{ 3 }\) 
  V. \({ CH }_{ 2 }-{ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 3 }\)
  VI.
  \({ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 }\) 
  VII.
  \({ CH }_{ 3 }-{ O }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad { CH }_{ 3 }\) 
  Identify the pairs of compounds that represent chain isomerism.

• 5)

  Explain why alkyl groups act as electron donors when attached to a π system.

CBSE 11th Standard Chemistry Subject The s-Block Elements Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Present a comparative account of the alkali and akaline earth metals with respect to the following characteristics.
  Tendency to form ionic/covalent compounds

• 2)

  Present a comparative account of the alkali and akaline earth metals with respect to the following characteristics.
  Nature of oxides and their solubility in water

• 3)

  Present a comparative account of the alkali and akaline earth metals with respect to the following characteristics.
  formation of oxosalts

• 4)

  Present a comparative account of the alkali and akaline earth metals with respect to the following characteristics.
  solubility of oxosalt

• 5)

  Present a comparative account of the alkali and akaline earth metals with respect to the following characteristics.
  Thermal stability of oxosalts

CBSE 11th Standard Chemistry Subject Equilibrium Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  A reaction between ammonia and boron trifluoride is given below : NH₃+BF₃⟶H₃N:BF₃ . Identify the acid and base in this reaction. Which theory explains it? What is the hybridisation of B and N in the reactants?

• 2)

  The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10^–3M. what is its pH ?

• 3)

  How can you predict the following stages of a reaction by comparing the value \({ K }_{ c }\) and \({ Q }_{ c }\) ?
  Net reaction proceeds in the forward direction.

• 4)

  The ionisation constant of HF,HCOOH and HCN at 298 are  6.8 x 10^-4 and 4.8 x 10 ^-9 respectively.Calculate the ionisation constant of the corresponding conjucate bases.
  To find Kb of  a conjugate  base , use the formula K_a.K_b = K_w = 1 x 10^-14  Conjugate bases of HF,HCOOH and HCN are F^- HCOO^- and CN^- respectively.

CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm³ at 27\(^{o}\)C. (R = 0.083 bar dm³ K^-1 mol^-1)

• 2)

  Explain the term 'Laminar flow'. Is the velocity of molecules same in all the layers in laminar flow? Explain your answer.

• 3)

  The variation of the vapour pressure of different liquids with temperature is shown in the figure below.
  
  If we take liquid C in a closed vessel and heat it continuously, at what temperature will it boil?

• 4)

  A vessel of 120 mL capacity contains a certain amount of gas at 35°C and 1.2 bar pressure. The gas is transferred to another vessel of volume 180 mL at 35°C. What would be its pressure?

• 5)

  The values of the van der Waal's constants for a gas are a = 4.10 dm⁶ bar mol^-2 and b = 0.035 dm³ mol^-1. Calculate the values of the critical temperature and critical pressure for the gas.

CBSE 11th Standard Chemistry Subject Classification of Elements and Periodicity in Properties Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  First member of each group of representative elements  ( i.e. sand p-block elements ) shows anomalous behaviour. Illustrate with two examples.

• 2)

  How does the metallic and non-metallic character vary on moving from left to right in a period?

• 3)

  Arrange the elements N, P, O, and S in the order of increasing first ionization enthalpy. Give the reason for the arrangement assigned.

• 4)

  Arrange the elements N, P, O, and S in the order of Increasing non-metallic character. Give the reason for the arrangement assigned.

• 5)

  Which of the following will have the most negative electron gain enthalpy and which the least negative? P, S, Cl, F. Explain your answer.

CBSE 11th Standard Chemistry Subject Hydrogen Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Comment on the reactions of dihydrogen with chlorine.

• 2)

  Describe the usefulness of water in biosphere and biological system.

• 3)

  Comment on the reactions of dihydrogen with copper(II) oxide

• 4)

  Do you expect different products in solution when aluminium (III) chloride and pottassium chloride are treated separately with 
  (i) normal water
  (ii) acidified water, and
  (iii) alkaline water? Write equations whatever necessary.

• 5)

  Compare the structure of H₂O and H₂O₂.

CBSE 11th Standard Chemistry Subject Structure of Atom Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  According to de-Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties.However, a cricket ball of mass 100g does not move like a wave when it is thrown by a bowler at a speed of 100km/h.Calculate the wavelength of the ball and explain why it does not show wave nature?

• 2)

  Why was the change in the Bohr model of atom is required, due to which important development(s), concept of movement of an electron in an orbit was replaced by the concept of probability of finding an electron in an orbital?What is the name given to the changed model of an atom?

• 3)

  The arrangement of orbitals on the basis of energy is based upon their (n + 1), lower is the energy. For orbitals having same values of (n + l), the orbitals with lower value of n will have lower energy.
  Based upon the above information, arrange the following orbitals in the increasing order of energy.
  a) 1s 2s, 3s, 2p
  b) 4s, 3s, 3p, 4d
  c) 5p, 4d, 5d, 4f, 6s
  d) 5f, 6d, 7s, 6p

• 4)

  The arrangement of orbitals on the basis of energy is based upon their (n + 1), lower is the energy. For orbitals having same values of (n + l), the orbitals with lower value of n will have lower energy.
  Based upon the above information, solve the questions given below.
  a) Which of the following orbitals has the lowest energy?
  4d, 4f, 5s, 5p
  b) Which of the following orbitals has the highest energy?
  5p, 5d, 5f, 6s, 6p

• 5)

  An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

CBSE 11th Standard Chemistry Subject Some Basic Concept of Chemistry Ncert Exemplar 3 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  A measured temperature on Fahrenheit scale is 200^o F. What will this reading be on Celsius scale?

• 2)

  45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L nitrous oxide was formed. The reaction is given below  
  2  N₂(g) + O₂(g)  \(\longrightarrow \) 2 N₂O (g)
  Which law is being obeyed in this experiment? Write the statement of the law.

• 3)

  If 4g of NaOH dissolves in 36g of H₂O, calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1 g mL^-1).

• 4)

  If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
  (i)  Is this statements true ?
  (ii)  If yes, according to which law ?
  (iii) Give one example related to this law.

• 5)

  A box contains some identical red coloured balls, labelled as A, each weighing 2 g. Another box contains identical blue coloured balls, labelled as B₁ each weighing 5 g. Consider the combinations AB, AB₂, A₂ B and A₂B₃ and shows that law of multiple proportion is applicable.

CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

• 2)

  Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.
  (a) C₆H₅OH
  (b) C₆H₅NO₂
  (c) CH₃CH = CHCHO
  (d) C₆H₅-CHO
  (e) C₆H₅-CH₂
  (f) CH₃CH = CHCH₂

• 3)

  Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.CH₃CH = CHCHO

• 4)

  Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.C₆H₅-CHO

• 5)

  Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.C₆H₅-CH₂

CBSE 11th Standard Chemistry Subject Environmental Chemistry Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Dissolved oxygen in water is very important for aquatic life. What processes are responsible for the reduction of dissolved oxygen in water?

• 2)

  A farmer was using pesticides on his farm. He used the product of his farm as food for rearing fishes. He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen?

• 3)

  What could be the harmful effects of improper management of industrial and domestic solid waste in a city?

• 4)

  For dry cleaning in the place of tetrachloroethene, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethene? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution. Explain.

• 5)

  Ozone is a toxic gas and is a strong oxidising agent even then its presence in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed?

CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Identify the most stable species in the following set of ions giving reasons
  \(\overset { + }{ C } { H }_{ 3 },\overset { + }{ C } { H }_{ 2 }Br,\overset { + }{ C } { H }B{ r }_{ 2 },\overset { + }{ C } B{ r }_{ 3 }\)

• 2)

  Identify the most stable species in the following set of ions giving reasons
  \(\overset { - }{ C } { H }_{ 3 },\overset { - }{ C } { H }_{ 2 }CI,\overset { - }{ C } { H }CI_{ 2 },\overset { - }{ C } CI_{ 3 }\)

• 3)

  Which of the following compounds will not exist as resonance hybrid. Give reason for your answer.
  (a) CH₃OH
  (b) CH₃CH = CHCH₂NH₂

• 4)

  For testing halogens in an organic compound with AgNO₃ solution sodium extract (Lassaigne's test) is acidified with dilute HNO₃. What will happen if a student acidifies the extract with dilute H₂SO₄ in place of diluate HNO₃?

CBSE 11th Standard Chemistry Subject The s-Block Elements Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH₄)₂CO₃ with sodium chloride? Explain.

• 2)

  Write the Lewis structure of O₂^- ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?

• 3)

  Complete the following reactions.
   \({ O }_{ 2 }^{ 2- }\)  +  H₂ O  \(\longrightarrow \)

• 4)

  Complete the following reactions.
  \({ O }_{ 2 }^{ - }\)  + H₂ O  \(\longrightarrow \) 

CBSE 11th Standard Chemistry Subject Hydrogen Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Hydrogen generally forms covalent compounds. Give reason?

• 2)

  Complete the following equations 
  \(PbS(s)+{ H }_{ 2 }{ O }_{ 2 }(aq)\)

• 3)

  Give reasons.
  Lakes freeze from top towards bottom

• 4)

  How do you expect the metallic hydrides to be useful for hydrogen storage? Explain

• 5)

  Explain why HCl is a gas and HF a liquid?

CBSE 11th Standard Chemistry Subject Hydrogen Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Complete the following equations 
  \(PbS(s)+{ H }_{ 2 }{ O }_{ 2 }(aq)\)

• 2)

  Basic principle of hydrogen economy is transporation and storage of energy in the form of liquid or gaseous hydrogen.Which property of hydrogen may be usefuk for this chemical equation if required.

• 3)

  Give reasons.
  Lakes freeze from top towards bottom

• 4)

  Give reasons.
  Ice floats on water

• 5)

  Explain why HCl is a gas and HF a liquid?

CBSE 11th Standard Chemistry Subject Structure of Atom Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Chlorophyll present in green leaves of plants absorbs light at 4.620 x 10¹⁴ Hz. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to?

• 2)

  Wavelengths of different radiations are given below.
  \(\lambda (A)=300\ nm,\ \lambda (B)=300\ \mu m,\ \lambda (C)=\ 3\ nm,\lambda (D)=30\overset { \circ }{ A } \)
  Arrange these radiations in the increasing order of their energies.

• 3)

  Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wavenumber (\(\bar { v } \)) of the yellow light.

• 4)

  Calculate the energy associated with the first orbit of He⁺. What is the radius of this orbit?

• 5)

  The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus ?

CBSE 11th Standard Chemistry Subject Equilibrium Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Why does fluorine not show disproportionation reaction?

• 2)

  The reaction
  \(v{ Cl }_{ 2 }(g)+2{ OH }^{ - }(aq)\longrightarrow { ClO }^{ - }(aq)+{ Cl }^{ - }(aq)+{ H }_{ 2 }O(l)\)
  represents the process of bleaching. Identify and name the species that bleaches the substances due to its oxidising action.
  Write the oxidation number of each element above its symbol and then identify the bleaching reagent by observing the change in oxidation number.

• 3)

  pH of a solution of a strong acid is 5.0.What will be the pH of the solution obtained after diluting the given solution 100 times?

• 4)

  Following data is given for the reaction,
  \(CaCO_{ 3 }(s)\rightarrow CaO(s)+CO_{ 2 }(s)\)
  \( { \Delta }_{ f }{ H }^{ o }[CaO(s)]=-635.1kJ{ mol }^{ -1 }\)
  \( { \Delta }_{ f }{ H }^{ o }[CO_{ 2 }(g)]=-393.5kJ{ mol }^{ -1 }\)
  \( { \Delta }_{ f }{ H }^{ o }[CaCO_{ 3 }(s)]=-1206.9kJ{ mol }^{ -1 }\)
  Predict the effect of temperature on the equilibrium constant of the above reaction.

CBSE 11th Standard Chemistry Subject Equilibrium Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Calculate the oxidation number of phosphorus in the following species.
  \({ HPO }_{ 3 }^{ 2- }\)

• 2)

  The aqueous solution of sugar does not conduct electricity.However, when sodium chloride is added to water, it conducts electricity.How will you explain in this statement on the basis of ionisation and how is it affected by concentration of sodium chloride?

• 3)

  The concentration of hydrogen ion in  a sample of soft drink is 3.8 x 10^-3 M.What is its pH?

• 4)

  Why does fluorine not show disproportionation reaction?

• 5)

  The reaction
  \(v{ Cl }_{ 2 }(g)+2{ OH }^{ - }(aq)\longrightarrow { ClO }^{ - }(aq)+{ Cl }^{ - }(aq)+{ H }_{ 2 }O(l)\)
  represents the process of bleaching. Identify and name the species that bleaches the substances due to its oxidising action.
  Write the oxidation number of each element above its symbol and then identify the bleaching reagent by observing the change in oxidation number.

CBSE 11th Standard Chemistry Subject Thermodynamics Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Although heat is path function but heats absorbed by the system under certain specific conditions is independent of path. what are those conditions? Explain when volume remains constant.

• 2)

  Although heat is path function but heats absorbed by the system under certain specific conditions is independent of path. what are those conditions? Explain when pressure remains constant.

• 3)

  The value of \({ \Delta }_{ f }{ H }^{ \Theta }\) for NH₃ is -91.8 kJ mol^-1. Calculate enthalpy change for the following reaction.
  \(2{ NH }_{ 3 } \ (g)\longrightarrow { N }_{ 2 }(g) \ + \ { 3H }_{ 2 }(g)\)

• 4)

  Standard molar enthalpy of formation, \({ \Delta }_{ f }{ H }^{ o }\) is just a special case of enthalpy of reaction, \({ \Delta }_{ r }{ H }^{ o }\). Is the \({ \Delta }_{ f }{ H }^{ o }\) for the following reaction same as \({ \Delta }_{ f }{ H }^{ o }\) ? Give reason for your answer.
  CaO(s) + CO₂(g)\(\longrightarrow \)CaCO₃(s);
  \({ \Delta }_{ f }{ H }^{ o }=-178.3 \ kJ \ { mol }^{ -1 }\)

• 5)

  How will you calculate the work done on an ideal gas in a compression, when change in pressure is carried out in infinite steps?

CBSE 11th Standard Chemistry Subject Thermodynamics Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  The enthalpy of a vaporisation of CCI₄ is 30.5 kJ mol^-1. Calculate the heat required for the vaporisation of 284g of CCI₄ at constant pressure (molar mass of CCI₄ =154 g mol^-1)

• 2)

  An ideal gas is allowed to expand against a constant pressure of 2 bar from 10 L to 50 L in one step. Calculate the amount of work done by the gas. If the same expansion were carried out reversibly, will the work done be higher or lower than the earlier case (given that 1 L bar = 100 J)?

• 3)

  Expansion of a gas in vacuum is called free expansion. Calculate the work done and the change in internal energy when 1L of ideal gas expands isothermally into vacuum until its total volume is 5 L?

• 4)

  18.0 g water completely vaporises at 100 ^oC and 1 bar pressure and the enthalpy change in the process is 40.79 KJ mol^-1. What  will be the enthalpy change for vaporising two moles of water under the same conditions? What is the standard enthalpy of vaporisation for water?

• 5)

  Although heat is path function but heats absorbed by the system under certain specific conditions is independent of path. what are those conditions? Explain when volume remains constant.

CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Why does sharp glass edge become smooth on heating it up to melting point in a flame? Explain which property of liquids is responsible for this phenomenon?

• 2)

  Explain the effect of increasing temperature of a liquid on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased?

• 3)

  Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosity. Also, give the reason for the assigned order in one line.
  Water, hexane (CH₃CH₂CH₂CH₂CH₂CH₃), glycerine (CH₂OHCH(OH)CH₂OH)

• 4)

  Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

• 5)

  Compressibility factor, Z of a gas is given as \(Z=\frac { pV }{ nRT } \) What is the value of Z an ideal gas?

CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Value of universal gas constant (R) is same for all gases. What is its physical significance?

• 2)

  Use the information and data given below to answer the question, stronger intermolecular forces result in higher boiling point.
  Strength of London forces increases with the number of electrons in the molecules. Boiling point of HF, HCI, HBr, and HI are 293 K, 189 K, 206 K and 238 K respectively.

• 3)

  Use the information and data given below to answer the question, stronger intermolecular forces result in higher boiling point.
  Strength of London forces increases with the number of electrons in the molecules. Boiling point of HF, HCI, HBr, and HI are 293 K, 189 K, 206 K and 238 K respectively.
  Looking at the trend of boiling points of HCI, HBr, and HI, explain out of dipole-dipole interaction and London interaction, which one is predominant here.

• 4)

  Use the information and data given below to answer the question, stronger intermolecular forces result in higher boiling point.
  Strength of London forces increases with the number of electrons in the molecules. The boiling point of HF, HCI, HBr, and HI are 293 K, 189 K, 206 K and 238 K respectively.
  Why is the boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest?

• 5)

  Why does sharp glass edge become smooth on heating it up to melting point in a flame? Explain which property of liquids is responsible for this phenomenon?

CBSE 11th Standard Chemistry Subject Some Basic Concept of Chemistry Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Sulphuric acid reacts with sodium hydroxide as follows
  \({ H }_{ 2 }{ SO }_{ 4 }+2NaOH{ \longrightarrow }{ Na }_{ 2 }{ SO }_{ 4 }+H_{ 2 }O\) When 1L of 0.1M sulphuric acid solution is allowed to react with 1L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is

• 2)

  If the density of a solution is 3.12 g mL^-1, the mass of 1.5 mL solution in significant figures will be.

• 3)

  One mole of any substance contains 6.022\( \times\)10²³ atoms / molecules.Number of molecules of H₂SO₄ present in 100 mL of 0.02 M H₂SO₄. What will be the solution?

• 4)

  One of the statements of Dalton's atomic theory is given below "compounds are formed when atoms of different elements combine in a fixed ratio". Which laws of chemical combination is not related to this statement?

• 5)

  The emphirical formula and molecular mass of a compound are CH₂O and 180 g respectively. What will be the molecular formula of the compound?

CBSE 11th Standard Chemistry Subject Some Basic Concept of Chemistry Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  If the concentration of glugose (C₆H₁₂O₆) in blood is 0.9 g L^-1, what will be the molarity of glugose blood?

• 2)

  What will be the molality of the solution contaning 18.25g of HCI gas in 500 g of water?

• 3)

  The reactant which is entirely consumed in the reaction is known as limiting reagent. In the reaction 2A + 4B\(\longrightarrow\)3C + 4D, when 5 moles of A react with 6 moles of B, then Which is the limiting reagent?

• 4)

  The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B \(\Rightarrow\) 3C + 4D, when 5 moles of A react with 6 moles of B, then calculate the amount of C formed?

• 5)

  If 500 ml of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?

CBSE 11th Standard Chemistry Subject Environmental Chemistry Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Dissolved oxygen in water is very important for aquatic life. What processes are responsible for the reduction of dissolved oxygen in water?

• 2)

  A farmer was using pesticides on his farm. He used the product of his farm as food for rearing fishes. He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen?

• 3)

  For dry cleaning in the place of tetrachloroethene, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethene? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution. Explain.

• 4)

  Ozone is a toxic gas and is a strong oxidising agent even then its presence in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed?

• 5)

  How is ozone produced in the stratosphere?

CBSE 11th Standard Chemistry Subject Environmental Chemistry Ncert Exemplar 2 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Dissolved oxygen in water is very important for aquatic life. What processes are responsible for the reduction of dissolved oxygen in water?

• 2)

  What could be the harmful effects of improper management of industrial and domestic solid waste in a city?

• 3)

  For dry cleaning in the place of tetrachloroethene, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethene? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution. Explain.

• 4)

  Ozone is a toxic gas and is a strong oxidising agent even then its presence in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed?

• 5)

  How is ozone produced in the stratosphere?

CBSE 11th Standard Chemistry Subject Structure of Atom Ncert Exemplar 1 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Which of the following will not show deflection from the path on passing through an electric field? Proton, cathode rays, electron, neutron

• 2)

  What is the experimental evidence in support of the idea that electronic energies in an atom are quantised?

• 3)

  out of the electron and proton which one will have a higher velocity to produce matter waves of the same velocity? Explain it.

• 4)

  Which of the following orbitals are degenerate?

• 5)

  Arranges, p and d- subshells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in the nucleus.

CBSE 11th Standard Chemistry Subject Thermodynamics Ncert Exemplar 1 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Enthalpy of combustion of carbon to CO₂ is –393.5 kJ mol^–1. Calculate the heat released upon formation of 35.2 g of CO₂ from carbon and dioxygen gas.

• 2)

  Given that \(\Delta H\) = 0 for mixing of two gases. Explain whether the diffusion of these gases into each other in a closed container is a spontaneous process or not?

• 3)

  The enthalpy of atomisation for the reaction,
  \({ CH }_{ 4 }\left( g \right) \longrightarrow C\left( g \right) +4H\left( g \right) \)
  is 1665 KJ mol^-1. What is the bond energy of C-H bond ?

• 4)

  Which quantity out of \(\Delta _{ r }G\) and \(\Delta _{ r }G^{ \circ }\) will be zero at equilibrium?

• 5)

  At 298 K, K_p for the reaction, N₂O₄(g) \(\leftrightharpoons \) 2NO₂(g) is 0.98. Predict whether the reaction is spontaneous or not.

CBSE 11th Standard Chemistry Subject Thermodynamics Ncert Exemplar 1 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Heat capacity (Cp) is an extensive property but specific heat (C) is an intensive property. What will be the relation between Cp and C for 1mole of water?

• 2)

  Identify the state functions and path functions out of the following. Enthalpy, entropy, heat, temperature, work, free energy.

• 3)

  Heat has randomising influence on a system and temperature is the measure of average chaotic motion of particles in the system. Write the mathematical relation which relates these three parameters.

• 4)

  Comment on the thermodynamic stability of NO(g), given
  \(\frac { 1 }{ 2 } N_{ 2 }(g)+\frac { 1 }{ 2 } { O }_{ 2 }(g)\rightarrow NO(g);\Delta _{ r }H^{ \circ }=90kJmol^{ -1 }\)
  \( NO(g)+\frac { 1 }{ 2 } O_{ 2 }(g)\rightarrow NO_{ 2 }(g)\Delta _{ r }H^{ \circ }=-74kJmol^{ -1 }\)

CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 1 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Name two phenomena that can be explained on the basis of surface tension.

• 2)

  The critical temperature(T_c) and critical pressure(P_c) of CO₂ are 30.98^oC and 78 atm respectively. Can CO₂(g) be liquefied at 32^oC and 80 atm pressure?

• 3)

  What will be the molar volume of nitrogen and argon at 273.15k and 1 atm?

• 4)

  The pressure exerted by saturated water vapor is called aqueous tension.what correction term will you apply to the total pressure to obtain a pressure of the dry gas?

CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 1 Mark Questions 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Name two intermolecular force that exists between HF molecules in a liquid state.

• 2)

  The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension water, alcohol (C₂H₅OH) and hexane [CH₃(CH₂)₄CH₃].

• 3)

  One of the assumptions of kinetic theory of gases states that "there is no force of attraction between the molecules of a gas "How far is this statement correct?Is it possible to liquefy an ideal gas? Explain.

• 4)

  The behavior of matter in different states is governed by various physical laws.According to you, what are the factor that determines the state of matter?

• 5)

  One of the assumptions of kinetic theory of gases is that there is no forces of attraction between the molecules of a gas. State and explain the evidence that shows that the assumption is not applicable for real gas.

CBSE 11th Standard Chemistry Subject Ncert Exemplar MCQ Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  A measured temperature on Fahrenheit scale is 200°F. What will this reading be on celsius scale?

• 2)

  If the density of a solution is 3.12 g ml^-1, the mass of 1.5 mL solution in significant figures is _____.

• 3)

  Which of the following statements indicates that law of multiple proportion is being followed?

• 4)

  The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?

• 5)

  What is the mass per cent of carbon in carbon dioxide?

CBSE 11th Standard Chemistry Subject Ncert Exemplar MCQ Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Which of the following statements about a compound is incorrect?

• 2)

  A measured temperature on Fahrenheit scale is 200°F. What will this reading be on celsius scale?

• 3)

  Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements.

  students		Readinds
  	(i)	(ii)
  A	3.01	2.99
  B	3.05	2.95

• 4)

  Which of the following reactions is not correct according to the law of conservation of mass?

• 5)

  Which of the following statements is correct about the reaction given below?
  \({ }_{4 \mathrm{Fe}}(s)+30_{2}(g) \longrightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}(g)\)

CBSE 11th Standard Chemistry Subject Ncert Exemplar 1 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  One mole of oxygen gas at STP is equal to?

• 2)

  What is the lowest value of n that allows g orbitals to exist?

• 3)

  Arranges, p and d- subshells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in the nucleus.

• 4)

  In \({ PO }_{ 4 }^{ 3- }\) ion, formal charge on each O-atom of P-O bond is.

• 5)

  A gas that follows Boyle's law, Charle's law and Avogadro's law is called an ideal gas.Under what condition a real gas would behave ideally?

CBSE 11th Standard Chemistry Subject Ncert Exemplar 1 Mark Questions 2021 Part - II - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Volume of a solution changes with change in temparature, then will the molality of the solution be affected by temparature? Give reason for your answer.

• 2)

  Which of the following orbitals are degenerate?

• 3)

  Why does the type of overlap given in the following figure not result in bond formation
  

• 4)

  The enthalpy of atomisation for the reaction,
  \({ CH }_{ 4 }\left( g \right) \longrightarrow C\left( g \right) +4H\left( g \right) \)
  is 1665 KJ mol^-1. What is the bond energy of C-H bond ?

CBSE 11th Standard Chemistry Subject Ncert Exemplar 1 Mark Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Volume of a solution changes with change in temparature, then will the molality of the solution be affected by temparature? Give reason for your answer.

• 2)

  What will be the mass of one ¹²C atom in g?

• 3)

  Arranges, p and d- subshells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in the nucleus.

• 4)

  Name two intermolecular force that exists between HF molecules in a liquid state.

• 5)

  What would the SI unit for the quantity pV²T²/n?

CBSE 11th Standard Chemistry Subject Ncert Exemplar 2 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Wavelengths of different radiations are given below.
  \(\lambda (A)=300\ nm,\ \lambda (B)=300\ \mu m,\ \lambda (C)=\ 3\ nm,\lambda (D)=30\overset { \circ }{ A } \)
  Arrange these radiations in the increasing order of their energies.

• 2)

  Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wavenumber (\(\bar { v } \)) of the yellow light.

• 3)

  18.0 g water completely vaporises at 100 ^oC and 1 bar pressure and the enthalpy change in the process is 40.79 KJ mol^-1. What  will be the enthalpy change for vaporising two moles of water under the same conditions? What is the standard enthalpy of vaporisation for water?

• 4)

  Hydrogen generally forms covalent compounds. Give reason?

• 5)

  Complete the following reactions.
   \({ O }_{ 2 }^{ 2- }\)  +  H₂ O  \(\longrightarrow \)

CBSE 11th Standard Chemistry Subject Ncert Exemplar 2 Mark Questions 2021 Part - II - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B \(\Rightarrow\) 3C + 4D, when 5 moles of A react with 6 moles of B, then calculate the amount of C formed?

• 2)

  A hydrogen atom has only one electron, so mutual repulsion between electrons is absent. However, in multielectron atom mutual repulsion between the electrons is significant.
  How does this affect the energy of an electron in the orbitals of the same principle quantum number in a multielectron atom?

• 3)

  The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus ?

• 4)

  Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

• 5)

  How will you calculate the work done on an ideal gas in a compression, when change in pressure is carried out in infinite steps?

CBSE 11th Standard Chemistry Subject Ncert Exemplar 2 Mark Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B \(\Rightarrow\) 3C + 4D, when 5 moles of A react with 6 moles of B, then calculate the amount of C formed?

• 2)

  Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wavenumber (\(\bar { v } \)) of the yellow light.

• 3)

  The electronic configuration of valence shell of Cu is \(3d^{10}4s^{1} and\ 3d^{9}4s^{2}\) How is this configuration explained?

• 4)

  Describe the change in hybridisation (if any) of the Al atom in the following reaction.
  \({ AlCl }_{ 3 }+{ Cl }^{ - }\longrightarrow { AlCl }_{ 4 }^{ - }\)

• 5)

  Group the given molecules as linear and non-linear molecules.

CBSE 11th Standard Chemistry Subject Ncert Exemplar 3 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Why was the change in the Bohr model of atom is required, due to which important development(s), concept of movement of an electron in an orbit was replaced by the concept of probability of finding an electron in an orbital?What is the name given to the changed model of an atom?

• 2)

  An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

• 3)

  Arrange the elements N, P, O, and S in the order of increasing first ionization enthalpy. Give the reason for the arrangement assigned.

• 4)

  Give reasons for the following.
  Water molecule has bent structure whereas carbon dioxide molecule is linear.

• 5)

  The variation of the vapour pressure of different liquids with temperature is shown in the figure below.
  
  At high altitude, atmospheric pressure is low (say 60 mm Hg). At what temperature will liquid D boil?

CBSE 11th Standard Chemistry Subject Ncert Exemplar 3 Mark Questions 2021 Part - II - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Write lewis structure of the following compounds and show formal charge each atom.

• 2)

  The variation of the vapour pressure of different liquids with temperature is shown in the figure below.
  
  At high altitude, atmospheric pressure is low (say 60 mm Hg). At what temperature will liquid D boil?

• 3)

  Give reasons why hydrogen resembles alkali metals?

CBSE 11th Standard Chemistry Subject Ncert Exemplar 3 Mark Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  A measured temperature on Fahrenheit scale is 200^o F. What will this reading be on Celsius scale?

• 2)

  The arrangement of orbitals on the basis of energy is based upon their (n + 1), lower is the energy. For orbitals having same values of (n + l), the orbitals with lower value of n will have lower energy.
  Based upon the above information, arrange the following orbitals in the increasing order of energy.
  a) 1s 2s, 3s, 2p
  b) 4s, 3s, 3p, 4d
  c) 5p, 4d, 5d, 4f, 6s
  d) 5f, 6d, 7s, 6p

• 3)

  How does the metallic and non-metallic character vary on moving from left to right in a period?

• 4)

  Write the resonance structures for  NO₂

• 5)

  Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm³ at 27\(^{o}\)C. (R = 0.083 bar dm³ K^-1 mol^-1)

CBSE 11th Standard Chemistry Subject Ncert Exemplar 5 Mark Questions With Solution 2021 - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Write down the outermost electronic configurations of alkali metals. How will you justify their placement in group 1 of the periodic table?

• 2)

  Write the significance/applications of dipole moment.

• 3)

  What is an ionic bond? With two suitable examples the difference between an ionic and a covalent bond?

• 4)

  At 60°C, dinitrogen tetroxide is 50 per cent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere.

• 5)

  Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A\(\rightarrow \) B along one route is \(\Delta _{ r }H \ and \ \Delta _{ r }H_{ 1 },\Delta _{ r }H_{ 2 },\Delta _{ r }H_{ 3 }....\)represent enthalpies of intermediate reactions leading to product B. What will be the relation between \(\Delta _{ r }H\) overall reaction and \(\Delta _{ r }H_{ 1 },\Delta _{ r }H_{ 2 }\) .....etc., for intermediate reactions.

CBSE 11th Standard Chemistry Subject Ncert Exemplar 5 Mark Questions 2021 Part - II - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Hydrogen gas is prepared in the laboratory by reacting dilute HCL with granulated zinc. Following reaction takes place.\(Zn+2HCL\rightarrow { ZnCL }_{ 2 }+{ H }_{ 2 }\)
  Calculate the volume of hydrogen gas liberated at STP when 32.65 g of zinc reacts with HCL. 1 mole of a gas occupies 22.7 L volume at STP; atomic mass of Zn = 65.3\(\mu\)

• 2)

  In p-block elements form acidic, basic and amphoteric oxides. Explain each property by giving two examples and also write the reactions of these oxides with water.

• 3)

  Write the significance/applications of dipole moment.

• 4)

  Represent diagrammatically the bond moments and the resultant dipole moment in CO₂, NF and CHCL₃.

• 5)

  PCl_5,PCl₃, and Cl₂ are at equilibrium at 500 k in a closed container and their concentrations are \(0.8\times { 10 }^{ -3 }\)mol L^-1,\(1.2\times { 10 }^{ -3 }\)mol L^-1  and  \(1.2\times { 10 }^{ -3 }\) , mol L^-1, respectively. Calculate the value of K_c for the reaction \({ PCl }_{ 5 }(g)\rightleftharpoons { PCl }_{ 3 }(g)+{ Cl }_{ 2 }(g)\) will be

CBSE 11th Standard Chemistry Subject Ncert Exemplar 5 Mark Questions 2021 Part - I - by Ashutosh Saran - Gurgaon - May 26, 2021 - View & Read

• 1)

  Hydrogen gas is prepared in the laboratory by reacting dilute HCL with granulated zinc. Following reaction takes place.\(Zn+2HCL\rightarrow { ZnCL }_{ 2 }+{ H }_{ 2 }\)
  Calculate the volume of hydrogen gas liberated at STP when 32.65 g of zinc reacts with HCL. 1 mole of a gas occupies 22.7 L volume at STP; atomic mass of Zn = 65.3\(\mu\)

• 2)

  Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic number".

• 3)

  Write the significance/applications of dipole moment.

• 4)

  What is an ionic bond? With two suitable examples the difference between an ionic and a covalent bond?

• 5)

  At 60°C, dinitrogen tetroxide is 50 per cent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere.

CBSE 11th Standard Chemistry Index (Textbook) Volume 2 - 2021 - by users_admin - May 18, 2021 - View & Read

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