31.

Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressure.

Reason : Even at low pressure, repulsive forces dominate for hydrogen gas.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

For a dilute solution, Raoult's law states that

• the relative lowering of vapour pressure is proportional to the amount of solute in solution

• the relative lowering of vapour pressure is equal to the mole fraction of solute

• the lowering of vapour pressure is equal to the mole fraction of the solute

• the vapour pressure of the solution is equal to the mole fraction of the solvent.

To a 25 mL H₂O₂ solution, excess of acidified solution of Kl was added. The iodine liberated required 20 ml of 0.3 N Na₂S₂O₃ solution. The volume strength of H₂O₂ solution is

• 1.344 g/L

• 3.244 g/L

• 5.4 g/L

• 4.08 g/L

In a homogenous reaction, A $\to$ B + C + D the initial pressure was P₀ and after time t it was P. Expression for rate constant k in terms of P₀, P and t will be

• $k = \frac{2.303}{t}\log \frac{2P_0}{3P_0 - P}$

• $k = \frac{2.303}{t}log\frac{2P_0}{P_0 - P}$

• $k = \frac{2.303}{t}\log \frac{3P_0 - P}{2P_0}$

• $k = \frac{2.303}{t}\log \frac{2P_0}{3P_0 - 2P}$

Which curve corresponds to the temperature dependence of the rate R of a simple one step reaction?

A 0.1 molal solution of an acid is 4.5% ionized. Calculate freezing point. (molecular weight of the acid is 300). K_f = 1.86 K mol^-1 kg.

• -0.194$°$C

• 2.00$°$C

• 0$°$C

• -0.269$°$C

The specific conductance of a N/ 10 KCl at 25°C is 0.0112 ohm^-1cm^-1.The resistance of cell containing solution at the same temperature was found to be 55 ohm. The cell constant will be

• 6.16 cm^-1

• 0.616 cm^-1

• 0.0616 cm^-1

• 616 cm^-1

A mixture of two miscible liquids A and B is distilled under equilibrium conditions at 1 atm pressure. The mole fraction of A in solution and vapour phase are 0.30 and 0.60 respectively. Assuming ideal behaviour of the solution and the vapour, calculate the ratio of the vapour pressure of pure A to that of pure B.

• 4.0

• 3.5

• 2.5

• 1.85

Schottky defect in crystals is observed when

• unequal number cations and anions are missing from the lattice

• equal number of cations and anions are missing from the lattice

• an ion leaves its normal site and occupies an interstitial site

• density of the crystal is increased.

Assertion : In rate law, unlike in the expression for equilibrium constants, the exponents for concentrations do not necessarily match the stoichiometric coefficients.

Reason : It is the mechanism and not the balanced chemical equation for the overall change that governs the reaction rate.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false