The concentration of hydrogen ions in a sample of soft drink is 3.8 × 10^–3M. The pH of soft drink is-
(Given: log 3.8 = 0.58)

1. 1.45
2. 2.42
3. 3.76
4. 2.79

The ionization constant of HF is 3.2 × 10^–4 and its solution concentration is 0.02 M. The  pH of the solution is-

1. 3.45
2. 2.62
3. 4.21
4.  1.89
 

The pH of 0.004M hydrazine solution is 9.7, its ionization constant K_b and pK_b are respectively-

1.  K_b = 8.96 × 10^–7; pK_b = 6.04
2. K_{b =} 7.26 × 10^–7 ; pK_b = 6.04
3. K_b = 8.96 × 10^–7 ; pK_b = 7.02
4. K_{b =} 7.26 × 10^–7 ; pK_b = 7.02

The pH of the solution in which 0.2M NH₄Cl and 0.1M NH₃ are present is:
(pK_b of ammonia solution is 4.75)

1. 12
2. 9
3. 6
4. 11

The ionization constant of ammonia is 1.77 × 10^–5. The pH of a 0.05M of ammonia solution is-

1. 12
2. 11
3. 10
4. 6

 

The pH after 50.0 mL of 0.10 ammonia solution is treated with 25.0 mL of 0.10M HCl solution is-
(K_b = 1.77 × 10^–5 )

1. 5.74
2. 10.12
3. 8.34
4. 9.24