At temperature T, a compound AB₂ (g) dissociates according to the reaction 2AB₂$\rightleftharpoons$2AB(g) +B₂(g) with a degree of  dissociation x, which is small compared with unity. The expression for K_p, in terms of x and the total pressure P , is:

1. Px³/2                                 

2. Px²/3

3. Px³/3                                 

4. Px²/2

For the reactions:

A $\rightleftharpoons$ B;    K_c = 2

B $\rightleftharpoons$ C;    K_c = 4

C $\rightleftharpoons$ D;   K_c = 6

K_c for the reaction, A $\rightleftharpoons$ D is:

1. (2+4+6)

2. (2x4)/6

3. (4x6)/2

4. 2x4x6

For the reaction equilibrium,

2NOBr(g) $\rightleftharpoons$2NO(g) + Br₂(g), if $P_{\mathit{B}{\mathit{r}}_{\mathit{2}}}$ = P/9 at equilibrium and P is total pressure. The ratio of K_p/P is equal to:

1. 1/9               

2. 1/81

3. 1/27               

4. 1/3

Which of the following salts will give the highest pH in the water?                   

1. KCl           

2. NaCl         

3. Na₂CO₃     

4. CuSO₄

The aqueous solution having the lowest pH:

1. NaOH                 

2. NH₄Cl

3. Na₂CO₃             

4. NaCl

 The following equilibria are given

 N₂ + 3H₂ $\rightleftharpoons$ 2NH₃,      K₁

N₂ + O₂ $\rightleftharpoons$ 2NO,          K₂

H₂ + $\frac{1}{2}$O₂ $\rightleftharpoons$ H₂O,       K₃

The equilibrium constant of the reaction, 2NH₃ + $\frac{5}{2}$O₂ $\rightleftharpoons$ 2NO + 3H₂O in terms of  K₁, K₂ and K₃ is  

1. $K_{\mathit{1}}{K}_{\mathit{3}}^{\mathit{3}}\mathit{/}{K}_{\mathit{2}}$                       

2. $K_2{K}_{\mathit{3}}^{\mathit{3}}\mathit{/}{K}_1$

3. K₁K₂K₃                            

4. K₁K₂/K₃ 

At a certain temperature, 2HI $\rightleftharpoons$H₂ +I₂ only 50% HI is dissociated at equilibrium. The equilibrium constant is:

1. 1.0                     

2. 3.0                 

3. 0.5               

4. 0.25

In the reaction, PCl₅ \(⇌ \)PCl₃ + Cl₂, the amounts of PCl₅, PCl_3, and Cl₂ at equilibrium are 2 moles each and the total pressure is 3 atm. The equilibrium constant K_p is: 

1. 1.0 atm                                       

2. 2.0 atm

3. 3.0 atm                                       

4. 6.0 atm

Find the effect of adding an inert gas at constant volume to the following equilibrium:

N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
1. The reaction stops.
2. The equilibrium shifts in the forward direction.
3. The equilibrium remains unaffected.
4. The equilibrium shifts in the backward direction.

In which of the following case reaction goes farthest to completion?

1. K=10³                                         

2. K=10^-2

3. K=10                                           

4. K=10⁰