Consider the nitration of benzene using mixed conc. H₂SO₄ and HNO₃. If a large amount

of KHSO₄ is added to the mixture, the rate of nitration will be

1. slower 

2. unchanged

3. doubled

4. faster

Among the following pairs of solution the one which is not an acidic buffer is:

1. HClO₄ and NaClO₄

2. CH₃COOH and CH₃COONa

3. H₂CO₃ and Na₂CO₃

4. H₃PO₄ and Na₃PO₄

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

1. KCl                               

2. NaCl

3. Na₂CO₃                       

4. CuSO₄

Which of these is least likely to act as a Lewis base?

1. CO                       

2. F^-

3. BF₃                     

4. PF₃

The molecule that is least likely to behave as Lewis base is: 

1. NH₃

2. BF₃

3. OH^-

4. H₂O

The value of $∆$H for the reaction

X₂(g) + 4Y₂(g) $\rightleftharpoons$2XY₄(g) is less than zero.

Formation 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

For the reaction N₂(g) + O₂(g)$\rightleftharpoons$ 2NO(g) the equilibrium constant is K₁. The equilibrium

constant is K₂  for the reaction 2NO(g) + O₂(g)$\rightleftharpoons$   2NO₂(g). What is K for the reaction

NO₂(g) $\rightleftharpoons$ + 1/2N₂(g)+ O₂(g)?

1. 1 / (4 K₁K₂)

2. [1 / K₁K₂)^1/2

3. 1 / (K₁K₂)

4. 1 / (2K₁K₂)

K_c and K_p are not equal for a reaction given below:

1. 2NO(g) $\rightleftharpoons$N₂(g) + O₂(g)

2. SO₂(g) + NO₂(g) $\rightleftharpoons$SO₃(g) + NO(g)

3. H₂(g) + I₂(g) $\rightleftharpoons$2HI(g)

4. 2C(s) + O₂(g) $\rightleftharpoons$2CO₂(g)

Which one of the following molecular hydrides acts as a Lewis acid?

1. NH₃         

2. H₂O         

3. B₂H₆           

4. CH₄

The ionisation constant of ammonium hydroxide is 1.77 x 10^-5 at 298 K. Hydrolysis constant of ammonium chloride is

1. 5.65 x 10^-10

2. 6.50 x 10^-12

3. 5.65 x 10^-13

4. 5.65 x 10^-12