11.

The amount of heat evolved when 500 cm³ of 0.1 M HCl is mixed with 200 cm³ of 0.2 M NaOH is

• 2.292 kJ

• 1.292 kJ

• 22.9 kJ

• 0.292 kJ

The enthalpy of vaporization of benzene is +35.3 kJ/mol at its boiling point, 80°C. The entropy change in the transition of vapour to liquid at its boiling point is

• -100

• +100

• +342

• -342

Based on the first law of thermodynamics, which one of the following is correct?

• For an isothermal process, Q = + W

• For an isochoric process, $∆$U = -Q

• For an adiabatic process, $∆$U= -W

• For a cyclic process, Q = -W

Consider the folowing equilibria with equilibrium constants K₁ and K₂ respectively,

SO₂  (g) + $\frac{1}{2}{\mathrm{O}}_2 \left(\mathrm{g}\right) \rightleftharpoons$SO₃ (g)

2SO₃ (g) $\rightleftharpoons$ 2SO₂ (g) + O₂ (g)

The equilibrium constants are related as

• 2K₁ = K${}_2^2$

• ${\mathrm{K}}_1^2 = \frac{1}{{\mathrm{K}}_2}$

• ${\mathrm{K}}_2^2 = \frac{1}{{\mathrm{K}}_1}$

• ${\mathrm{K}}_2 = \frac{2}{{\mathrm{K}}_1^2}$

For the reversible reaction, A (s) + B (g) $\rightleftharpoons$ C (g) + D (g), $∆\mathrm{G}°$ = -350 kJ, which one of the following statements is true?

• The reaction is thermodynamically non-feasible

• The entropy change is negative

• Equilibrium constant is greater than one

• The reaction should be instantaneous

The spin only magnetic moment of Fe²⁺ ion (in BM) is approximately

• 4

• 7

• 5

• 6

Excess of silver nitrate solution is added to 100 mL of 0.01 M pentaaqua chloro chromium (III) chloride solution. The mass of silver chloride obtained in grams is [Atomic mass of silver is 108].

• 287 × 10^-3

• 143.5 × 10^-3

• 143.5 × 10^-2

• 287 × 10^-2

The following data were obtained during the first order decomposition of 2A (g) → B (g) + C (s) at a constant volume and at a particular temperature.

S. No.	Time	Total pressure in Pascal
1.	At the end of 10 min	300
2.	After completion	200

The rate constant in min^-1 is

• 0.0693

• 69.3

• 6.93

• 6.93 × 10^-4

The activation energy of  a reaction at a given temperature is found to be 2.303 RT J mol^-1. The ratio of rate constant to the Arrhenius factor is

• 0.01

• 0.1

• 0.02

• 0.001

pH value of which one of the following is not equal to one?

• 0.1 M CH₃COOH

• 0.1 M HNO₃

• 0.05 M H₂SO₄

• 50 cm³ 0.4 M HCl + 50 cm³ 0.2 M NaOH