An aqueous solution of which salt has the lowest pH?

1. NaOH                 

2. NH₄Cl

3. Na₂CO₃             

4. NaCl

The value of $∆$H for the reaction,

   X₂(g) + 4Y₂(g) $\rightleftharpoons$2XY₄ (g)

is less than zero. Formulation of XY₄(g) will be favored at:                           

1. Low pressure and Low temperature

2. High temperature and Low pressure

3. High pressure and Low temperature

4. High temperature and High pressure

Salting out action of the soap is based on:

1. Complex ion formation

2. Common ion effect

3. Solubility product

4. Acid-base neutralization

Which is not an acid salt?

1. NaH₂PO₂                                   

2. NaH₂PO₃

3. NaH₂PO₄                                   

4.  NaHSO₃

 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 

The pK_a for acid A is greater than pK_a for acid B. The strong acid is:

1. Acid A                                           

2. Acid B

3. Are equally strong                         

4. None of the above

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

A solution of FeCl₃ in water acts as acidic due to:

1. Acidic impurities                         

2. Ionization

3. Hydrolysis of Fe³⁺                       

4. Dissociation

Which of the following solution does not act as buffer?

1. H₃PO₄ + NaH₂PO₄

2. Na₂CO₃ + H₂CO₃

3. HCl + NH₄Cl

4. CH₃COOH + CH₃COONa

Which equilibrium can be described as Lewis acid-base reaction but not Bronsted acid-base reaction?

1. H₂O + CH₃COOH$\rightleftharpoons$H₃O⁺ + CH₃COO^-

2. 2NH₃ + H₂SO₄ $\rightleftharpoons$$2{\mathrm{NH}}_4^{+}$ + ${\mathrm{SO}}_4^{2-}$

3. NH₃ + CH₃COOH $\rightleftharpoons$${\mathrm{NH}}_4^{+}$ + CH₃COO^-

4. [Cu(H₂O)₄]²⁺ + 4NH₃ $\rightleftharpoons$ [Cu(NH₃)₄]²⁺ + 4H₂O