When equal volume of the following solutions are mixed, which of the following gives maximum precipitate? (Ksp of AgCl=10-12)

1. 10-4 MAg+ and 10-4 M Cl-

2. 10-3 MAg+ and 10-3 M Cl-

3. 10-5 MAg+ and 10-5 M Cl-

4. 10-6 MAg+ and 10-6 M Cl-

Subtopic:  Solubility Product |
 65%
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The percentage hydrolysis of NaCN in (N80) aqueous solution [Dissociation constant of HCN is 1.3×10-9 and Kw=1.0×10-14] is

1. 8.2

2. 9.6

3. 5.26

4. 2.48

Subtopic:  Salt Hydrolysis & Titration |
 61%
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Hydrolysis constant KA and KB of two salts of weak acids HA and HB
are 10-8 and 10-6 respectively. If the dissociation constant of the third acid HC is 10-2. The order of acidic strengths of three acids will be

1. HA>HB>HC

2. HB>HA>HC

3. HC>HA>HB

4. HA=HB=HC

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 62%
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A solution containing NH4Cl and NH4OH has a hydroxide ion concentration of 10-6 mol litre-1, which of the following hydroxides could be precipitated when this solution is added in equal volume to a solution containing 0.1 M of metal ions?

1. AgOH (Ksp=5×10-3)

2. Cd(OH)2 (Ksp=8×10-6)

3. Mg(OH)2 (Ksp=3×10-11)

4. Fe(OH)2 (Ksp=8×10-16)

Subtopic:  Solubility Product |
 53%
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In the precipitation titration of KCl against AgNO3, K2CrO4 is used as an indicator since, AgCl is white coloured. End point is detected by appearance of deep yellow coloured precipitate of Ag2CrO4. The minimum concentration of chromate ion required for detection of end point is [Ksp of AgCl=2.5×10-10 and Ksp of Ag2CrO4=1.8×10-12]

1. 7.3×10-2 M

2. 5.3×10-4 M

3. 7.3×10-3 M

4. 3.6×10-5 M

Subtopic:  Solubility Product |
 55%
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The concentration of hydroxyl ion in a solution left after mixing 100 mL of 0.1 M MgCl2 and 100 mL of 0.2 M NaOH [Ksp of Mg(OH)2=1.2×10-11] is

1. 2.8×10-3

2. 2.8×10-2

3. 2.8×10-4

4. 2.8×10-5

Subtopic:  Solubility Product |
 51%
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When H2S is passed through an aqueous solution of an equimolar mixture of Zn2+ and Pb2+ acidified with dilute acetic acid, ZnS is not precipitated, because

1. Ksp (ZnS)<Ksp (PbS)

2. Ksp (ZnS)>Ksp (PbS)

3. H2S decreases the Ksp of Zns

4. H2S increases the Ksp of PbS

Subtopic:  Solubility Product |
 68%
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0.1 M solution of three different sodium salts NaX, NaY and NaZ have pH values 7.0, 9.0 and 11.0 respectively. The correct order of dissociation constant values of these acids is

1. KHX<KHY<KHZ

2. KHX>KHY>KHZ

3. KHX>KHZ>KHY

4. KHX<KHY<KHZ

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 73%
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Silver acetate is a slightly soluble salt of a weak acid (Ka=1.75×10-5). At 25°C, 100 g of water dissolves 1.04 g of crystalline silver acetate. The density of saturated solution of silver acetate at 20°C is 1.01 g/cc. The solubility product constant for silver acetate at 20°C

1. 2.43×10-3

2. 3.87×10-3

3. 7.74×10-5

4. 1.35×10-5

Subtopic:  Salt Hydrolysis & Titration |
 63%
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Separate solutions of four sodium salts NaW, NaX, NaY and NaZ had pH 7.0, 9.0, 10.0 and 11.0 respectively. When each solution is 0.1 M, the strongest acid is

1. HW

2. HX

3. HY

4. HZ

Subtopic:  pH calculation |
 79%
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