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

The oxide that is not expected to react with sodium hydroxide is : 

1. B₂O₃           

2. CaO

3. SiO₂             

4. BeO

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

(1) SrCl₂                             

(2) BaCl₂

(3) MgCl₂                           

(4) CaCl₂

The value of equilibrium constant of the reaction HI (g) $\rightleftharpoons$ $\frac{1}{2}$ H₂(g) + $\frac{1}{2}$ I₂(g) is 8.0. The equilibrium constant of the reaction

H₂(g) + I₂(g) $\rightleftharpoons$2HI(g) will be

$$\begin{gathered} 1. \frac{1}{16} \\ 2. \frac{1}{64} \\ 3. 16 \\ 4. \frac{1}{8} \end{gathered}$$

The pOH of a solution at 25$°$C that contains 1 x 10^-10 M of hydronium ions is:  

1. 7.00                               

2. 4.00

3. 9.00                                 

4. 1.00