Ka for HCN is 5×10-10 at 25°C. For maintaining a constant pH of 9, the volume of 5 M KCN solution required to be added to 10 mL of 2 M HCN solution is-

1. 2 mL

2. 3 mL

3. 4.2 mL

4. 5.6 mL

Subtopic:  Buffer |
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The approximate pH of a solution formed by mixing equal volumes of solutions of 0.1 M sodium propionate and 0.1 M propanoic acid (the dissociation constant of propanoic acid is 1.3×10-5 mol dm-3) will be

1. 2.45

2. 4.89

3. 5.98

4. 6.89

Subtopic:  pH calculation |
 72%
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The dissociation constant of acetic acid is 1.6×10-5. The degree of dissociation (α) of 0.01 M acetic acid in the presence of 0.1 M HCl is equal to

1. 0.4

2. 0.026

3. 1.6

4. 0.016

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 60%
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If the equilibrium constant of the reaction of weak acid HA with strong base is 109, then pH of 0.1 M NaA is

1. 3

2. 9

3. 7

4. 6

Subtopic:  pH calculation |
 70%
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If Ksp of Al(OH)3 is 1.0×10-15 M. Find at what pH does 1.0×10-3 M Al3+ precipitate on the addition of buffer of NH4Cl and NH4OH solution.

1. 10

2. 10.5

3. 11

4. 12

Subtopic:  pH calculation |
 56%
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The solubility of CaF2 in water at 298 K is 1.7×10-3 gm per 100 cm3. The solubility product of CaF2 at 298 K is

1. 4.14×10-11

2. 4.14×1011

3. 4.14×10-6

4. 4.14×106

Subtopic:  Solubility Product |
 63%
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A solution of monoprotic weak acid has acidity constant Ka the minimum intial concentration 'c' in terms of Ka, such that the concentration of the undissociated acid can be equated to 'c' within a 10% limit of error, would be

1. 70 Ka

2. 90 Ka

3. 50 Ka

4. 30 Ka

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 79%
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The solubility product of PbI2 is 7.47×10-9 at 15°C and 1.39×108 at 25°C. The molar heat of solution of PbI2 is (use log 1.86=0.2695)

1. 44.29 kJ/mol

2. 46.25 kJ/mol

3. 29.37 kJ/mol

4. 21.15 kJ/mol

Subtopic:  Solubility Product |
 53%
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Which of the following compounds is in the correct sequence in terms of relative basic strength?

1. C2H5O->CHC->OH-

2. CHC->-OH>C2H5O-

3. CHC->C2H5O->OH-

4. C2H5O->OH->CHC-

Subtopic:  Acids & Bases - Definitions & Classification |
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The concentration of CH3COOH that will have the same [H+] as obtained from 10-2 M HCOOH, is-

(Ka(CH3COOH)=10-5, Ka(HCOOH)=10-4)

1. 10 M

2. 5 M

3. 10-1 M

4. 6 M

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 79%
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