For the reversible reaction,

N₂ (g) + 3H₂(g) $\rightleftharpoons$2NH₃ (g) + heat

According to Le Chatelier’s principle, the equilibrium will shift in the forward direction by:                   

1. Increasing the concentration of NH₃ (g) 

2. Decreasing the pressure

3. Decreasing the concentrations of N₂ (g)and H₂(g)

4. Increasing pressure and decreasing temperature

The strongest acid among the following is:          

1. H₂SO₄           

_2. HClO₃       

3. HClO₄         

4. H₂SO₃ 

The conjugate acid of NH₂^- is                           

1. N₂H₄   

2. N${\mathrm{H}}_4^{+}$   

3. NH₄OH   

4. NH₃

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

1. K=10³                                         

2. K=10^-2

3. K=10                                           

4. K=10⁰

On addition of inert gas at constant volume to the reaction, N₂ + 3H₂$\rightleftharpoons$2NH₃ at  equilibrium:

1. the reaction halts

2. forward reaction is favored

3. the reaction remains unaffected

4. backward reaction is favored

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

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

 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 

An aqueous solution of which salt has the lowest pH?

1. NaOH                 

2. NH₄Cl

3. Na₂CO₃             

4. NaCl

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

1. KCl           

2. NaCl         

3. Na₂CO₃     

4. CuSO₄