The empirical formula of sucrose is _______.

Cathode rays are deflected by _______.

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

The molecule Ne₂ does not exist because ______.

With rise in temperature, the surface tension of a liquid

For an endothermic reaction ______.

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

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

The decomposition of H₂O₂ is retarded by

Which one of the following alkaline earth metal carbonates is thermally most stable

Which of the following molecules have zero dipole moment?

The hybridization state of a carbocation is ______.

Tolueue reacts with chlorine in the presence of light to give ______.

The pollutant released in Bhopal gas tragedy was

How is empirical formula of a compound related to its molecular formula?

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol^–1.

Give the name and symbol for each of the atoms which have the following ground state electronic configurations in their outer shells.
3s² 3p⁶ 4s²

Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

What do you understand by laminar flow of a liquid?

Carbon monoxide is allowed to expand isothermally and reversibly from 10\({ m }^{ 3 }\) to 20\({ m }^{ 3 }\) at 300K and work obtained is 4.754kJ. Calculate the number of moles of carbon monoxide.

Under what conditions each of the following equilibria can exist?
Gas-solution equilibrium

Arrange the following metals in the order in which they displace each other from the solution of their salts. Al, Cu, Fe, Mg and Zn.

Write two reactions to explain amphoteric nature of water

What happens when crystals of washing soda are exposed to air?

A compound A of boron reacts with NMe₃ to give an adduct B which on hydrolysis gives a compound C and hydrogen gas. Compound C is an acid. Identify the compounds A, B and C. Give the reactions involved.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

What happens when
ethyl alcohol is heated in the presence of H₂SO₄ at 443 K?

What is the nature of classical smog?

Calculate the volume of 1.00 mol L^-1 aqueous solution of sodium hydroxide that is neutralised by 200mL of 2.00mol L^-1 aqueous hydrochloric acid and the mass of sodium chloride obtained. Neutralisation reaction is \(NaOH(aq)+HCl(aq)\longrightarrow NaCl(aq)+H_{ 2 }O(l)\)

In the ultraviolet of atomic spectrum of hydrogen, a line is obtained at 1050\(\mathring{A}\). Calculate the energy of one million photons of this wavelength.

Predict which atom in each of the following pairs has the greater first ionisation enthalpy and explain your answer.
F and Ne

An element A combines with B. An atom of A contains two electrons in its outermost shell whereas that of B has six electrons in its outermost shell. The electrons are transferred from the atom A to the atom B.
What is the nature of bond between A and B?

What type of curves are obtained when at constant temperature, we plot
V vs p

A 5 L cylinder contained 10 moles of oxygen gas at 27^oC.Due to sudden leakage through the hole, all the gas escaped into the atmosphere and the cylinder got empty.If the atmospheric pressure is 1.0 atmosphere, calculate the work done by the gas(1 L atm = 101.3 J)

How much volume of 0.1M \(C{ H }_{ 3 }COOH\)Should be added to 50 ml of 0.2 m \(C{ H }_{ 3 }COOH\)Solution to prepare a buffer solution of Ph 4.91

Using the standard electrode potentials given in the Table , predict if the reaction between the following is feasible:
(a) Fe³⁺ (aq) and I^-(aq)
(b) Ag⁺(aq) and Cu(s)
(c) Fe³⁺(aq)and Cu(s)
(d) Ag(s) and Fe³⁺(aq)
(e) Br₂ (aq) and Fe²⁺(aq)

Discuss the principle and method of softening of hard water by synthetic ion-exchange resins.

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

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.

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

An alkane has a molecule mass of 72. Give all the possible structural isomers along with their IUPAC names.

A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.

Calculate the number of moles in the following 
(a) 7.85 g of iron
(b) 4.68 mg of silicon
(c) 65.6 \( \mu\)  g of carbon

Calculate the wavelength for the emission transition if it starts from the orbit having radius 1.3225 nm and ends at 211.6 pm. Name the series to which this transition belongs and the region of the spectrum.

Write the name and the atomic number of the following elements.
(i) The third alkali metal
(ii) The fourth alkaline earth metal  
(iii) The sixth element of second transition series
(iv) The second inner transition element
(v) The fifth noble gas.

Give reason why BCl₃ is planar and anhydrous AlCl₃ is tetrahedral?

A given mass of a gas collected over water at 25\(^{0}\)C has a pressure of 500 mm Hg.Calculate the pressure if its volume is reduced to half of its original volume(aqueous tension at 25\(^{0}\)C = 24mm of Hg)

For oxidation of iron, \(4Fe(s)+{ 3O }_{ 2 }(g)\rightarrow 2{ Fe }_{ 2 }{ O }_{ 3 }(s)\) entropy change is -549.4 JK^-1mol^-1 at 298K. Inspite of negative entropy change of this reaction, why is the reaction spontaneous? (\({ \triangle }_{ r }{ H }^{ \circleddash }\)for this reaction is -1648 x 10³ Jmol^-1)

Balance the following equation by the oxidation number method.
\({ I }_{ 2 }+{ S }_{ 2 }{ O }_{ 3 }^{ 2- }\longrightarrow { I }^{ - }+{ S }_{ 4 }{ O }_{ 6 }^{ 2- }\)

Scientist of UK has designed the cars, working on hydrogen fuel cells instead of petrol engines. Here hydrogen is used as sources of electrical energy i.e. a reaction of hydrogen and oxygen is used to generate electrical energy. It has many advantages over the conventional fossil fuels and electric power generation.
What is the efficiency of the fuel cell as the comparison to other conventional fuels?

Reema takes milk every day . She also take curd and other milk products.She takes green leafy vegitables and fruits also. An adult body contains about 25g of magnesium and 1200 g of calcium and 5 g of iron .these elements must be a part of our diet. All enzymes that utilize ATP in phosphate transfer required magnesium as co-factor. the main pigment for the absorption of light in plants is chlorophyll, which contains magnesium. were as Anita does not like milk and takes lot of junk food.
How are green lefy vegitables rich in magnesium?

Describe the general trends in the following properties of the elements in groups 13 and 14.
iv)Oxidation states

Which of the following compounds will show cis-trans isomerism?
CH₂= CBr₂

The density of the water at room temperature is 0.1 g / mL. How many molecules are there in a drop of water if its volume is 0.05 mL?

Define ionisation enthalpy.Discuss the factors affecting ionisation enthalpy of the elements and its trends in the periodic table.

Write the significance/applications of dipole moment.

Discuss the following property of liquids.
Boiling point

Define Standard enthalpy of formation

Calculate the degree of ionization of 0.05M acetic acid if its pKa value is 4.74. How is the degree of dissociation affected when its solution also contains (a) 0.01M (b) 0.1M in HCl ?

Calculate the oxidation number of the underlined element in
\({ Ba }_{ 2 }\underline { Xe } 0_{ 6 }\)

Give ion electron equations for the reactions.
Oxidation of ferrous ions to ferric ions by hydrogen peroxide both in acidic and basic media.

What happens when alkali metals are dissolved in ammonia?

Name the elements of group 14. Discuss the variation in characteristics of the group with reference to
iv)reactivity with oxygen

Write structures of various carbocations that can be obtained from 2-methylbutane. Arrange these carbocations in order of increasing stability.

What happens when benzene is treated with:
Mixture of conc. H₂SO₄ and conc. HNO₃ at 330K

Have you ever observed any water pollution in your area? What measures would you suggest to control it?