If K_b and K_f for a reversible reactions are 0.8 x 10^–5 and 1.6 x 10^–4 respectively, the value of the equilibrium constant is __________

(a)

20

(b)

0.2 x 10^-4

(c)

0.05

(d)

none of these

The equilibrium constant for a reaction at room temperature is K₁ and that at 700 K is K₂. If K₁ > K₂, then _____________

(a)

The forward reaction is exothermic

(b)

The forward reaction is endothermic

(c)

The reaction does not attain equilibrium

(d)

The reverse reaction is exothermic

Solubility of carbon dioxide gas in cold water can be increased by ____________

(a)

increase in pressure

(b)

decrease in pressure

(c)

increase in volume

(d)

none of these

For which of the following reaction, the degree 0 dissociation (a) and equilibrium constant (K_p) are related as \({ K }_{ p }=\cfrac { 4\alpha ^{ 2 }P }{ \left( 1-{ \alpha }^{ }2 \right) } ?\)

(a)

\({ N }_{ 2 }{ O }_{ 4\left( g \right) }\rightleftharpoons 2{ NO }_{ 2 }\left( g \right) \)

(b)

\({ H }_{ 2\left( g \right) }+{ I }_{ 2\left( g \right) }\rightleftharpoons 2HI\left( g \right) \)

(c)

\(N_{ 2\left( g \right) }+{ 3H }_{ 2\left( g \right) }\rightleftharpoons 2NH_{ 3\left( g \right) }\)

(d)

\(PCI_{ 3\left( g \right) }Cl_{ 2\left( g \right) }\rightleftharpoons { PCI }_{ 5\left( g \right) }\)

In which of the following does the reaction go almost to completion?

(a)

K_c = 10³

(b)

K_c = 10²

(c)

K_c = 10^-2

(d)

K_c= 10^-3

Hydrogen (a moles) and iodine (b moles) react to give 2x moles of the HI at equilibrium. The total number of moles at equilibrium is _____________

(a)

a + b + 2x

(b)

(a - b) + (6  - 2x)

(c)

(a + b)

(d)

a + b - x

\(A+B\rightleftharpoons C+D,{ k }_{ c }\)for this reaction is 10. If c 1, 2, 3, 4 mole/litre of A, B, C and D respectively are present in a container at 25°C, the direction of reaction will be ____________

(a)

From left to right

(b)

From right to left

(c)

Reaction is at equilibrium

(d)

Unpredictable

4g H₂, 32g O₂, 14g N₂ and 11g CO₂ are taken ina bulb of 500ml. Which one of these has maximum active mass?

(a)

H₂

(b)

O₂

(c)

N₂

(d)

CO₂

For reaction, \(2A+B\rightleftharpoons 2C,\ K=x\) . Equilibrium constant for \(C\rightleftharpoons A+1/2B\) will be ____________

(a)

x

(b)

\(\cfrac { x }{ 2 } \)

(c)

\(\cfrac { 1 }{ \sqrt { x } } \)

(d)

\(\sqrt { x } \)

XY₂ dissociates as,\(XY_{ 2\left( g \right) }\rightleftharpoons { XY }_{ \left( g \right) }+Y_{ \left( g \right) }\) Initial pressure of XY₂ is 600mm Hg. The total pressure at equilibrium is 800mm Hg. Assuming volume of system to remain constant, the value of K_p is ______________

(a)

50

(b)

100

(c)

400

(d)

20