The dissociation constants for aniline, acetic acid and ionic product of water at 25°C are 3.83×10-10, 1.75×10-5 and 1.008×10-14 respectively. The degree of hydrolysis of aniline acetate in a decinormal solution is

1. 0.56%

2. 55%

3. 5.6%

4. 2.75%

 

Subtopic:  Salt Hydrolysis & Titration |
 57%
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A solution of benzoic acid (a weak monobasic acid) is titrated with NaOH. The pH of the solution is 4.2 when half of the acid is neutralized. The dissociation constant of the acid will be:

1. 3.2×10-5

2. 6.42×10-4

3. 6.31×10-5

4. 8.7×10-8

Subtopic:  Buffer |
 56%
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The mixture that shows the maximum buffer capacity is:

1. 0.1 M CH3COOH+0.2 MCH3COONa

2. 0.1 M CH3COOH+0.15 MCH3COONa

3. 0.05 M CH3COOH+0.15 MCH3COONa

4. 0.1 M CH3COOH+0.12 MCH3COONa

Subtopic:  Buffer |
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The pH of a solution containing 0.1 mol of CH3COOH, 0.2 mol of CH3COONa, and 0.05 mol of NaOH in 1 L of solution is-

(pKa of CH3COOH=4.74 and log 5=0.7)

1. 4.56

2. 5.44

3. 5.04

4. 3.74

Subtopic:  Buffer |
 55%
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18 ml of mixture of acetic acid and sodium acetate required 6 ml of 0.1 M NaOH for neutralization of the acid and 12 ml of 0.1 M HCl for reaction with salt separately. If pKa of the acid is 4.75, what is the pH of the mixture?

1. 5.05

2. 4.75

3. 4.5

4. 4.6

Subtopic:  pH calculation |
 51%
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What is the minimum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl2 and saturated with 0.10 M H2S?

[Given : Ksp of ZnS=10-21, Ka1×Ka2 of H2S=10-20]

1. 4

2. 3

3. 2

4. 1

Subtopic:  Solubility Product |
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Which of the following is an amphiprotic (can accept and give protons) ion?

1. HPO3-

2. H2PO2-

3. H3PO4

4. H2PO4-

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 56%
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Calculate the ratio of F- and HCOO- in a mixture of 0.1 M HF (Ka=6.6×10-4) and 0.2 M HCOOH (Ka=2×10-4).

1. 2 : 2.3

2. 1 : 3.3

3. 3.3 : 2

4. 3.3 : 1

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 62%
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A buffer solution is prepared by mixing 10 mL of 1.0 M acetic acid with 20 mL of 0.5 M sodium acetate which is then diluted
to 100 mL with distilled water. If the pKa of CH3COOH is 4.76, the pH of the buffer solution prepared is -
1. 5.21

2. 4.76

3. 4.34

4. 5.35

Subtopic:  Buffer |
 70%
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The pH of a solution obtained by mixing equal volume of solutions having pH=3 and pH=4. [log 5.5=0.7404]

1. 3.26

2. 3.5

3. 4.0

4. 3.42

Subtopic:  pH calculation |
 77%
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