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 sharp pH change near the equivalence point in acid-base titration enables indicator detection. Which of the following equations correctly explains the pH change based on the concentration ratio of an indicator's conjugate acid (HIn) and base (In⁻) forms?

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