The equilibrium:

2SO₂(g) + O₂(g) ⇌ 2SO₃(g)

shifts in the forward direction when:

1. A catalyst is used
2. An absorbent is used to remove SO₃ as soon as it is formed
3. Small amounts of reactants are used
4. None of the above

The pH of blood is maintained by CO₂ by and H₂CO₃ in the body and chemical constituents of blood. This phenomenon is called:

1. colloidal                           

2. buffer action

3. acidic                               

4. salt balance

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