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

Subtopic:  pH calculation |
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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


 

Subtopic:  pH calculation |
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The pH after 50.0 mL of 0.10 ammonia solution is treated with 25.0 mL of 0.10M HCl solution is-
(
Kb = 1.77 × 10–5 )

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

Subtopic:  pH calculation |
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The solubility of A2X3 in pure water, assuming that neither kind of ion reacts with water is-
(solubility product of A
2X3Ksp = 1.1 × 10–23)

1. 5.0 × 10
–5 mol/L.
2. 1.0 × 10
–5 mol/L
3. 1.0 × 10
–4 mol/L
4. 5.0 × 10
–4 mol/L.

Subtopic:  Common Ion Effect |
 75%
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The values of Ksp of two sparingly soluble salts Ni(OH)2 and AgCN are 2.0 × 10–15 and 6 × 10-17 respectively.
The more soluble salt is-

1. Ni(OH)
2 is more soluble than AgCN
2. AgCN is soluble in than Ni(OH)
2
3. Both have similar solubility
4. None of the above

Subtopic:  Solubility Product |
 77%
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The molar solubility of Ni(OH)2 in a solution containing 0.10 M NaOH, given that the ionic product of Ni(OH)2 is 2.0 × 10–15, is:

1. 2.0 × 10–13 M
2. 2.0 × 10
–12 M
3. 2.0 × 10
–11 M
4. 2.0 × 10
–16 M

Subtopic:  Solubility Product |
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The pH of 0.004M hydrazine solution is 9.7, its ionization constant Kb and pKb are respectively-

1.  Kb = 8.96 × 10–7; pKb = 6.04
2.
Kb = 7.26 × 10–7 ; pKb = 6.04
3.
Kb = 8.96 × 10–7 ; pKb = 7.02
4.
Kb = 7.26 × 10–7 ; pKb = 7.02

Subtopic:  pH calculation |
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The ionization constant of the hypochlorous acid is 2.5 × 10–5. The concentration of hypochlorous acid 0.08 M. The percent dissociation of HOCl is-

1. 2.56 %
2. 1.21 %
3. 1. 76 %
4. 2.21 %

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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The pH of 0.1M monobasic acid is 4.50. The value of pKa of the monobasic acid is-

1. 6. 3
2. 7.4
3. 8.0
4. 9.0

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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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

 

Subtopic:  pH calculation |
 62%
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