# Ionic Equilibrium of Analysis MCQ with Answers for IIT JAM 2023

Ionic Equilibrium of Analysis MCQ with Answers for IIT JAM 2023

## Ionic Equilibrium of Analysis MCQ with Answers for IIT JAM 2023

1. At 25°C, the solubility product (Ksp) of CaF2 in water is 3.2 × 10-11 The solubility (in mole per kg of water) of the salt at the same temperature (ignore ion pairing) is

(a) 4.0 × 10-6
(b) 3.2 × 10-4
(c) 2.5 × 10-4
(d) 2.0 × 10-4

2. At 298 K 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water The pH of the resulting solution is [Given: pKa of acetic acid is 4.75]

(a) 4.9
(b) 4.6
(c) 4.3
(d) 2.3

3. The minimum concentration of silver ions that is required to start the precipitation of Ag2S (K = 1 × 10-51) in a 0.1 M solution of S2- is

(a) 1 × 10-49 M
(b) 1 × 10-50 M
(c) 1 × 10-26 M
(d) 1 × 10-25 M

4. The acid dissociation constant (Ka) for HCOOH, CH3COOH, CH2CICOOH, and HCN at 25°C are 1.8 × 10-4, 1.8 × 10-5, 1.4 × 10-3 and 4.8 × 10-10, respectively. The acid that gives the highest pH at the equivalence point when 0.2 M solutions of each acid is titrated with a 0.2 M solution of sodium hydroxide is

(a) HCOOH
(b) CH3COOH
(c) CH2CICOOH
(d) HCN

5. The pH of a 1 × 10-8 M HCl Solution is close to

(a) 8.0
(b) 7.1
(c) 6.9
(d) 6.0

6. The pH of a 1.0 × 10-3 M solution of weak acid HA is 4.0. The acid dissociation constant Ka is

(a) 1.0 × 10-3
(b) 1.0 × 10-4
(c) 1.0 × 10-5
(d) 2.0 × 10-5

7. The pH of the solution prepared from 0.005 moles of Ba(OH)2 in 100 cc water is

(a) 10
(b) 12
(c) 11
(d) 13

8. The solubility of A2X3 is z mol dm-3. Its solubility product is

(a) 6 z2
(b) 64 z4
(c) 36 z5
(d) 108 z5

9. 0.1 moles of CH3NH2 (Kb = 5 × 10-4) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H+  concentration in the solution?

(a) 8 × 10-2 M
(b) 8 × 10-11 M
(c) 1.6 × 10-11 M
(d) 8 × 10-5 M

10. Select the correct alternative.
If pKb for fluoride ion at 25° C is 10.83, the ionization constant of hydrofluoric acid in water at this temperature is :

(a) 1.74 × 10-5 M
(b) 3.52 × 10-3 M
(c) 6.75 × 10-4 M
(d) 5.38 × 10-2 M