In the exothermic reaction of oxidizing SO₂ by O₂ to SO₃, what factors determine the maximum yield of SO₃?

 

1.	Temperature is reduced and pressure is increased.
2.	Temperature is increased and pressure is kept constant.
3.	Both temperature and pressure are reduced.
4.	Both temperature and pressure are increased.

If a solution of 0.1 M NH₄OH and 0.1 M NH₄Cl has pH 9.25, then the pK_b of NH₄OH will be:

Among the following , the compound with highest pH is : 

1. CH₃COOK

2. Na₂CO₃ 

3. NH₄Cl

4. NaNO₃

The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection. pH of the solution is related to the concentrations of the conjugate acid (HIn) and base (In^-) forms of the indicator by the expression: 

1. $\log \left[\frac{{\mathrm{In}}^{-}}{\mathrm{HIn}}\right]={\mathrm{pK}}_{\mathrm{In}}-\mathrm{pH}$

2. $\log \left[\frac{\mathrm{HIn}}{{\mathrm{In}}^{-}}\right]={\mathrm{pK}}_{\mathrm{In}}+\mathrm{pH}$

3. $\log \left[\frac{\mathrm{HIn}}{\mathrm{In}}\right]=\mathrm{pH}-{\mathrm{pK}}_{\mathrm{In}}$

4. $\log \left[\frac{\mathrm{In}}{\mathrm{HIn}}\right]=\mathrm{pH}-{\mathrm{pK}}_{\mathrm{In}}$

Solubility of a M₂S salt is $3.5\times {10}^{-6}$ then find out solubility product.

1. $1.7\times {10}^{-6}$

2. $1.7\times {10}^{-16}$

3. $1.7\times {10}^{-18}$

4. $1.7\times {10}^{-12}$

The solubility of MX₂ type electrolyte is $0.5\times {10}^{-4}$ mol L^-1. Then find out K_sp of electrolytes.

1. $5\times {10}^{-12}$

2. $25\times {10}^{-10}$

3. $1\times {10}^{-13}$

4. $5\times {10}^{-13}$

The solubility product of a sparingly soluble salt AX₂ is $3.2\times {10}^{-11}$.  Its solubility (in mol L^–1) is:

1. $5.6\times {10}^{-6}$

2. $3.1\times {10}^{-4}$

3. $2\times {10}^{-4}$

4. $4\times {10}^{-4}$

What is the degree of ionization of an acid solution with a concentration of 0.005 M and a pH of 5?
 

1. $0.1\times {10}^{-2}$

2. $0.2\times {10}^{-2}$

3. $0.5\times {10}^{-4}$

4. $0.6\times {10}^{-6}$

pKa value of four acids are given below. The strongest acid is

(I) 4.0

(II) 3.5

(III) 2.5

(IV) 2

1. I

2. II

3. III

4. IV

A solution has hydrogen ion concentration 0.0005 M, its pOH is

1. 8.2798

2. 10.6990

3. 12.7854

4. 13.3344