### 11th Standard CBSE Chemistry Study material & Free Online Practice Tests - View and download Sample Question Papers with Solutions for Class 11 Session 2019 - 2020 CBSE

#### 11th CBSE Chemistry The p-block Elements Model Question Paper - by Ashutosh Saran - Gurgaon Aug 20, 2019 - View & Download

• 1)

Which of the following compound is an important catalyst as well as a Lewis acid?

• 2)

Silicon carbide (SiC) is known as

• 3)

Which of the following is a purely acidic oxide?

• 4)

Which of the following molecules have zero dipole moment?

• 5)

Silicon shows a diagonal relation with

#### 11th CBSE Chemistry The s-Block Elements Model Question Paper - by Ashutosh Saran - Gurgaon Aug 19, 2019 - View & Download

• 1)

Which one of the following alkali metals give hydrated salts?

• 2)

The reducing property of alkali metals follows the order

• 3)

Lithium shows a diagonal relationship with

• 4)

The oxide of which of the following metals is amphoteric?

• 5)

Hydrides as well as halides of alkaline earth metals tend to polymerize

#### 11th CBSE Chemistry Hydrogen Model Question Paper - by Ashutosh Saran - Gurgaon Aug 19, 2019 - View & Download

• 1)

Hydrogen gas is generally prepared by the

• 2)

On treatment of hard water with zeolite, sodium ions get exchanged with

• 3)

The higher density of water than that of ice is due to

• 4)

Zeolite is

• 5)

The decomposition of H2O2 is retarded by

#### 11th Standard CBSE Chemistry Redox Reactions Model Question Paper - by Ashutosh Saran - Gurgaon Aug 13, 2019 - View & Download

• 1)

On the reaction 2Ag + 2H2SO4 $\rightarrow$ Ag2So4 + 2H2O+SO2  sulphuric acid acts as

• 2)

When methane is burnt in oxygen to produce CO2 and H20 the oxidation number of carbon changes by

• 3)

Which of the following are not redox reactions?

• 4)

Which one among the following is not example of autoredox reaction?

• 5)

In the ethylene molecule the two carbon atoms have the oxidation numbers.

#### 11th Standard CBSE Chemistry Unit 7 Equilibrium Model Question Paper - by Ashutosh Saran - Gurgaon Aug 03, 2019 - View & Download

• 1)

The equilibrium expression, Kc= [CO2] represents the reaction.

• 2)

In a closed system
A(S) ⇌ 4 B(g) + 3 C(g)
If partial pressure of C is doubled, then partial pressure of B will be

• 3)

What effect does a catalyst have on the equilibrium position of a reaction?

• 4)

A chemist dissolves an excess of BaSO4 in pure water at 25°C if its Ksp = 1 x 10-10 what is the concentration of barium in the water?

• 5)

If in a mixture where Q = k is combined, then what happens?

#### 11th CBSE Chemistry Unit 6 Thermodynamics Model Question Paper - by Ashutosh Saran - Gurgaon Jul 31, 2019 - View & Download

• 1)

A thermodynamic state function is a quantity

• 2)

A reaction, A + B $\rightarrow$  C + D + q is found to have a positive entropy change. The reaction will be

• 3)

As per the available data:

• 4)

Thermodynamics is applicable to

• 5)

An isochoric process takes place at constant

#### 11th CBSE Chemistry Unit 5 State of Matter Important Question Paper - by Ashutosh Saran - Gurgaon Jul 30, 2019 - View & Download

• 1)

For one mole of a gas, the ideal gas equation is

• 2)

Viscosity of a liquid is a measure of

• 3)

The cleansing action of soaps and detergents is due to

• 4)

The compressibility factor, z for an ideal gas is

• 5)

Which of the following gases will have the lowest rate of diffusion?

#### 11th Standard CBSE Chemistry Unit 4 Chemical Bonding and Molecular Structure Important Question Paper - by Ashutosh Saran - Gurgaon Jul 27, 2019 - View & Download

• 1)

A co-ordinate bond is formed by

• 2)

The species CO, CN- and N2 are

• 3)

The molecule Ne2 does not exist because

• 4)

Which one is diamagnetic among NO, NO and NO-?

• 5)

sp3, sp2 and sp hybridized carbon atom, the p character is maximum in:

#### 11th Standard CBSE Chemistry Unit 3 Classification of Elements and Periodicity in Properties Important Question Paper - by Ashutosh Saran - Gurgaon Jul 26, 2019 - View & Download

• 1)

The highest ionization energy is exhibited by

• 2)

Which of the following oxides is neutral?

• 3)

Which of the following is arranged in order of increasing radius?

• 4)

What is the electronic configuration of the elements of group 14?

• 5)

Among the following elements, which has the least electron affinity?

#### 11th CBSE Chemistry Unit 2 Structure of Atom Important Question Paper - by Ashutosh Saran - Gurgaon Jul 25, 2019 - View & Download

• 1)

Cathode rays are deflected by

• 2)

In a sodium atom (atomic number = 11 and mass number = 23) and the number of neutrons is

• 3)

The Balmer series in the spectrum of hydrogen atom falls in

• 4)

The idea of stationary orbits was first given by

• 5)

de Broglie equation is

#### 11th CBSE Chemistry Unit 1 Some Basic Concept of Chemistry Important Question Paper - by Ashutosh Saran - Gurgaon Jul 25, 2019 - View & Download

• 1)

One mole of CO2 contains

• 2)

5.6 litres of oxygen at NTP is equivalent to

• 3)

How many grams are contained in 1 gram atom of Na?

• 4)

12 g of Mg will react completely with an acid to give:

• 5)

Which of the following has the highest mass?

#### 11th CBSE Chemistry First Revision HOTS question paper - by Bala Dec 29, 2018 - View & Download

• 1)

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

• 2)

What type of hybridisation is involved in SF6?

• 3)

Why a liquid boils at a lower temperature at the top of a mountain than at sea level?

• 4)

What is the condition for spontaneity in terms of free energy change?

• 5)

The compound YBa2Cu3O7, Which shows superconductivity, has copper in x oxidation state. Assume that the rare earth element yttrium is in its usual +3 oxidation state. Predict the value of x.

#### Chemistry CBSE 11th NCERT Questions and Answers - by Bala Dec 29, 2018 - View & Download

• 1)

In Millikan's' s experiment, static electric charge on the oil drops has been obtained by shining x Rays. If the static electric charge on the oil drops is -1.282x10-18 C, calculate the number of electrons present on it.

• 2)

Which of the following has maximum bond angle?
H2O, CO2, NH3, CH4

• 3)

Explain the physical significance of van derWaals' parameters

• 4)

When 430 J of work was done on a system, it lost 120 J of energy as heat.Calculate the value of internal energy change($\Delta U$) for this process.

• 5)

Does the oxidation number of an element in any molecule or any polyatomic ion represent the actual charge on it?

#### Chemistry CBSE Class 11 Model Question Paper - by Bala Dec 29, 2018 - View & Download

• 1)

Which of the following has lowest frequency?
X-rays, $\gamma$ -rays, microwaves

• 2)

Why N2 is more stable than 02? Explain on the basis of molecular orbital theory.

• 3)

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

• 4)

If enthalpy of fusion and enthalpy of vaporisation of sodium metals are 2.6 and 98.2KJ mol-1 respectively, what is the enthalpy of sublimation of sodium.

• 5)

Assign oxidation number to the underlined elements in each of the following species.
NaH2P O4

#### The p-block Elements Important Questions from 11th CBSE Chemistry - by Bala Dec 15, 2018 - View & Download

• 1)

Which of the following compound is an important catalyst as well as a Lewis acid?

• 2)

Carbon-60 contains

• 3)

Silicon carbide (SiC) is known as

• 4)

Which of the following is a purely acidic oxide?

• 5)

Silicon shows a diagonal relation with

#### 11th Chemistry Organic Chemistry : Some Basic Principles and Techniques - by Bala Dec 10, 2018 - View & Download

• 1)

In the organic compound CH2=CH-CH2-CH2-C$\equiv$CH, the CH-CH2 bond is formed by the interaction of a pair of hybridised orbitals:

• 2)

Which of the following carbocation is most stable?

• 3)

The following reaction is classified as:
CH3CH2I + KOH (aq) $\rightarrow$CH3CH2OH + KI

• 4)

The bond that undergoes heterolytic cleavage most readily is

• 5)

Which of the following are electrophiles?

#### 11th CBSE Chemistry Hydrocarbons Model Question Paper - by Bala Dec 01, 2018 - View & Download

• 1)

Which of the following is correct regarding the stability of carbocation?

• 2)

The peroxide effect in anti-Markovnikov addition involves

• 3)

Benzene reacts with acetyl chloride in the presence of AlCl3 to give

• 4)

An aqueous solution of compound A gives ethane on electrolysis, the compound A is

• 5)

Which of the following is less reactive than benzene towards electrophilic substitution reactions?

#### 11th Chemistry Environmental Chemistry Important Question Paper - by Bala Nov 30, 2018 - View & Download

• 1)

Which of the following acid is most abundant in acid rain?

• 2)

Which of the following causes less pollution?

• 3)

BOD is a measure of

• 4)

The pollutant released in Bhopal gas tragedy was

• 5)

What are primary and secondary pollutants of the air?

#### 11th Chemistry Revision Model Question Paper 1 - by Bala Nov 29, 2018 - View & Download

• 1)

How many moles of atoms are present in 9.0 g of aluminum?

• 2)

How can you prove that red oxide of copper is not an element ?

• 3)

What physical meaning is attributed to the square of the absolute value of wave function $|\psi |^{ 2 }$?

• 4)

Write the number designation of a group that has 2 electrons beyond a noble gas configuration.

• 5)

What is a spontaneous change? Give one example.

#### Environmental Chemistry - Important Questions Model Paper 1 In 11th Chemistry - by Bala Aug 01, 2018 - View & Download

• 1)

What is the temperature range of the atmosphere?

• 2)

What is the % composition of ${ CO }_{ 2 }$in the pure dry air?

• 3)

What is chlorosis?

• 4)

What is the importance of measuring BOD of a water body?

• 5)

Name any four methods for waste management.

#### Hydrocarbons - Important Questions Model Paper 1 In 11th Chemistry - by Bala Aug 01, 2018 - View & Download

• 1)

What happen when iodoethane is reduced with hydroiodic acid and red phosphorus?

• 2)

What do you understand by skew conformation?

• 3)

How would you distinguish between Propene and Propyne

• 4)

State Huckel's rule for determining whether a molecule is aromatic or not.

• 5)

What is difference between alkylation and acylation?

#### P - Block Elements - Important Questions Model Paper 1 In 11th Chemistry - by Bala Aug 01, 2018 - View & Download

• 1)

What is inert pair effect?

• 2)

What type of hybridisation of central atom is possible in  $\left[ GeCl_{ 6 } \right] ^{ 2- }$ ?

• 3)

What is the formula of kernite, an ore of boron?

• 4)

Define photosynthesis. In what way it is helpful for us?

• 5)

What is the maximum covalency of silicon in its compounds?

#### S - Block Elements - Important Questions Model Paper 1 In 11th Chemistry - by Bala Jul 31, 2018 - View & Download

• 1)

Lithium is the only alkali metal that forms nitride directly on reaction with air.Explain.

• 2)

Which colours are imparted to flame when the following elements are introduced in the flame one by one?
Barium

• 3)

Potassium carbonate cannot be prepared by Solvay process. Why?

• 4)

The second ionisation enthalpy of calcium is more that of first and yet calcium forms MgCI2 not MgCL. why?

• 5)

Why are elements of group 2 known as alkaline earth metals?

#### Hydrogen - Important Questions Model Paper 1 In 11th Chemistry - by Bala Jul 31, 2018 - View & Download

• 1)

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

• 2)

Name the compound each in which hydrogen exists in negative oxidation state

• 3)

Classify the following as covalent, ionic or interstitial hydrides.
CaH2, LaH2 RbH, GeH2, TiH2, NaH, NH3

• 4)

Why is hydrogen peroxide stored in wax lined bottles?

• 5)

Why does hard water not form lather with soap?

#### Redox Reactions - Important Questions Model Paper 1 In 11th Chemistry - by Bala Jul 31, 2018 - View & Download

• 1)

What is the most essential conditions that must be satisfied in a redox reaction?

• 2)

Find the value of n in 4MnO4-+8H+ +ne- $\rightarrow$ Mn2+ +4H2O

• 3)

In the reaction, $Mn{ O }_{ 2 }+4HCl\longrightarrow MnCl_{ 2 }+{ Cl }_{ 2 }+2H_{ 2 }O$  which species is oxidised?

• 4)

Is the reaction, $N{ H }_{ 3 }+HCl\longrightarrow { NH }_{ 4 }^{ + }+Cl^{ - },$ an oxidation-reduction reaction?Explain your answer

• 5)

Can we use KCI as electrolyte in the salt bridge of the cell, Cu(s) I Cu2 (aq) II Ag+(aq) I Ag(s)?

#### Equilibrium - Important Questions Model Paper 1 In 11th Chemistry - by Bala Jul 31, 2018 - View & Download

• 1)

A tank is full of water. Water is coming in as well as going out at same rate. What will happen to level of water in a tank? What is name given to such a state?

• 2)

Complete the statement. If solubility of Al2(SO4)3 is X, its solubility product will be..................

• 3)

For the reaction,${ H }_{ 2 }(g)+{ I }_{ 2 }(g)\rightleftharpoons 2HI(g)$ the standard free energy is  $\Delta { G }^{ \circleddash }>0$ . How is the equilibrium constant effected?

• 4)

What will be the pH of 1M$N{ a }_{ 2 }{ so }_{ 4 }$solution?

• 5)

Is it possible to get a precipitate of $Fe(OH{ ) }_{ 3 }$at pH=2? given reason.

#### Thermodynamics - Important Questions Model Paper 1 In 11th Chemistry - by Bala Jul 30, 2018 - View & Download

• 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)

In the equation, ${ N }_{ 2 }(g)+3{ H }_{ 2 }(g)\rightleftharpoons 2N{ H }_{ 3 }(g)$ what would be the sign of work done?

• 3)

What an ideal gas expands into vacuum, there is neither adsorption nor evolution of heat. Why?

• 4)

Increase in enthalpy of the surroundings is equal to decrease in enthalpy of the system. Will the temperature of system and surroundings be the same when they are in thermal equilibrium?

• 5)

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?

#### State Of Matter - Important Questions Model Paper 1 In 11th Chemistry - by Bala Jul 30, 2018 - View & Download

• 1)

What is the value of gas constant in SI units?

• 2)

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

• 3)

What is the difference between normal boiling point and standard boiling point?

• 4)

Explain the physical significance of van derWaals' parameters

• 5)

How much time would it take to distribute one Avogadro number of wheat grains if 1010 grains are distributed each second?
1NA=6.022 $\times$1023 where NA =Avogadro's number. Convert time into years.

#### 11th Chemistry Model Question Paper 4 - by Bala Jul 30, 2018 - View & Download

• 1)

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

• 2)

What type of  atomic orbitals  can overlap to form molecular orbitals?

• 3)

What is valence bond approach for the formation of covalent bond?

• 4)

Why axial bonds of PCI5 are longer than equatorial bonds?

• 5)

Why is the energy of  ${ \pi 2p }_{ x }$ and  ${ { \pi 2p } }_{ y }$ molecular orbital lower than ${ \sigma 2p }_{ z }$ molecular orbital in ${ N }_{ 2 }$ molecule?

#### Classification Of Elements And Periodicity In Properties - Important Questions Model Paper In 11th Chemistry - by Bala Jul 30, 2018 - View & Download

• 1)

What is the basic theme of organisation in the periodic table?

• 2)

What is the most important cause of periodicity?

• 3)

An element X belongs to the third period of p-block. It has 4 elements in the outermost shell. Name the element.

• 4)

Four elements have the following first ionisation enthalpies ( in kJ mol-1); 869, 941, 1191 and 1142. The elements, in random order, are Se, Br, Te and I. Which element has an ionisation enthalphy of 869 kJ mol-1 and 1142 kJmol-1 respectively?

• 5)

Give examples of three cations and three anions which are isoelectronic with neon.

#### 11th Chemistry Model Question Paper 3 - by Bala Jul 27, 2018 - View & Download

• 1)

What is the difference in the origin of cathode rays and anode rays?

• 2)

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

• 3)

What is the difference between atomic mass and mass number?

• 4)

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

• 5)

What do you mean by saying that energy of the electron is quantised?

#### 11th Chemistry Model Question Paper 2 - by Bala Jul 27, 2018 - View & Download

• 1)

Using the unit conversion factor, express 1.54mm s-1 into pm $\mu$s-1 .

• 2)

How many moles of atoms are present in 9.0 g of aluminum?

• 3)

Calculate the mass of a sample of iron metal that contains 0.250 moles of iron atoms.

• 4)

Calculate the number of gram molecules of water in a beaker conatining 576 g of water

• 5)

Give an example of molecule in which the ratio of the molecular formula is six times the empirical formula.

### CBSE Education Study Materials

#### 11th CBSE Chemistry 2019 - 2020 Academic Syllabus Ashutosh Saran - Gurgaon Aug 21, 2019

Chemistry 2019 - 2020 Academic Syllabus

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#### Tips to score good marks in CBSE Class 11 Chemistry ADMIN-ENGLISH Jan 23, 2019

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#### CBSEStudy Material - Sample Question Papers with Solutions for Class 11 Session 2019 - 2020

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