The relation for calculating pH of a solution containing weak acid and its salt is:

1. pH = pK_a + log$\frac{[\mathrm{Conjugate}<mspace\; width="1em"></mspace>\mathrm{Base}]}{\left[\mathrm{Acid}\right]}$

2. pH = pK_a - log$\frac{[\mathrm{Conjugate}<mspace\; width="1em"></mspace>\mathrm{Base}]}{\left[\mathrm{Acid}\right]}$

3. pH = pK_a + log$\frac{[\mathrm{Conjugate}<mspace\; width="1em"></mspace>\mathrm{Base}]}{\left[\mathrm{Salt}\right]}$

4. pOH = pK_a - log$\frac{\left[\mathrm{Acid}\right]}{[\mathrm{Conjugate}<mspace\; width="1em"></mspace>\mathrm{Base}]}$

Which of the following factors increases the solubility of a gas in a liquid?

1. Addition of a catalyst

2. Increasing the pressure

3. Decreasing the pressure

4. Increasing the temperature

The molecule that is least likely to act as a Lewis base is:     

1. CO         

2. \(F^{-}\)         

3. AlCl₃      

4. PF₃

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

For a given solution pH = 6.9 at 60$°$C, where K_w=10^-12. The solution is:

1. acidic                                         

2. basic

3. neutral                                         

4. unpredictable

The equilibrium:

2SO₂(g) + O₂(g) ⇌ 2SO₃(g)

shifts in the forward direction when:

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