Chemical Equilibrium Test

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Chemical Equilibrium Test - 22

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Weekly Quiz Competition

Question 1
4 / -1

An aqueous solution contains Ni²⁺ , Co²⁺ and Pb²⁺ ions at equal concentrations. The solubility product of NiS, PbS and CoS in water at 25^oC are 1.4 × 10^-24, 3.4 × 10^-28 and 3 × 10^-26, respectively. Indicate which of these ions will be precipitated first and last when sulphide concentration is progressively increased from zero?

A
NiS and PbS

B
NiS and CoS

C
CoS and NiS

D
PbS and NiS
Question 2
4 / -1

The solubility of AgC1 in 0.2 M NaCl is
(K_sp of AgCl = 1.8 × 10^-10)

A
1.8 × 10^-11 M

B
9 × 10^-10 M

C
6.5 × 10^-12 M

D
5.6 × 10^-11
Question 3
4 / -1

The solubility of AgCl is l × 10^-5 mol/L. Its solubility in 0.1 molar sodium chloride solution is

A
1 × 10^-10

B
1 × 10^-5

C
1 × 10^-9

D
1 × 10^-4

Solution
Question 4
4 / -1

The solubility product of a sparingly soluble salt AX₂ is 3.2 × 10^-11. Its solubility (in mol/L) is

A
5.6 × 10^-6

B
3.1 × 10^-4

C
2 × 10^-4

D
4 × 10^-4
Question 5
4 / -1

When ammonium chloride is added to ammonia solution, the pH of the resulting solution will be

A
increased

B
seven

C
decreased

D
unchanged
Question 6
4 / -1

Solubility of AgCl at 20°C is 1.435 × 10^-3 g/ L. The solubility product of AgCl is

A
1 × 10^-5

B
1 × 10^-10

C
1.435 × 10^-5

D
108 × 10^-3

Solution
Question 7
4 / -1

At 30^oC, the solubility of Ag₂ CO₃ (K_sp = 8 × 10^-12) would be greatest in 1 L of

A
0.05 M Na₂ CO₃

B
0.05 M AgNO₃

C
pure water

D
0.05 M NH₃

Solution
Question 8
4 / -1

The K_sp of Ca₃ (PO₄)₂ is

A
[Ca²⁺][PO₄^3-]²

B
[Ca²⁺]³ [PO₄^3-]

C
[Ca²⁺][PO₄^3-]

D
[Ca²⁺]³ [PO₄^3-]²
Question 9
4 / -1

If solubility of calcium hydroxide is √3, then its solubility product will be

A
27

B
3

C
9

D
12√3
Question 10
4 / -1

The molar solubility (in mol L^-1) of a sparingly soluble salt MX₄ is 's'. The corresponding solubility product is K_SP. S is given in terms of K_SP by the relation

A
S = (K_SP 1/28)^1/4

B
S = (128 K_SP)^1/4

C
S = (256 K_SP)^1/5

D
S = (K_SP/256)^1/5

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Chemical Equilibrium Test - 22

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Chemical Equilibrium Test - 22

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Question 1

NiS and PbS

NiS and CoS

CoS and NiS

PbS and NiS

Question 2

1.8 × 10-11 M

9 × 10-10 M

6.5 × 10-12 M

5.6 × 10-11

Question 3

1 × 10-10

1 × 10-5

1 × 10-9

1 × 10-4

Solution

Question 4

5.6 × 10-6

3.1 × 10-4

2 × 10-4

4 × 10-4

Question 5

increased

seven

decreased

unchanged

Question 6

1 × 10-5

1 × 10-10

1.435 × 10-5

108 × 10-3

Solution

Question 7

0.05 M Na2 CO3

0.05 M AgNO3

pure water

0.05 M NH3

Solution

Question 8

[Ca2+][PO43-]2

[Ca2+]3 [PO43-]

[Ca2+][PO43-]

[Ca2+]3 [PO43-]2

Question 9

27

3

9

12√3

Question 10

S = (KSP 1/28)1/4

S = (128 KSP)1/4

S = (256 KSP)1/5

S = (KSP/256)1/5

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1.8 × 10^-11 M

9 × 10^-10 M

6.5 × 10^-12 M

5.6 × 10^-11

1 × 10^-10

1 × 10^-5

1 × 10^-9

1 × 10^-4

5.6 × 10^-6

3.1 × 10^-4

2 × 10^-4

4 × 10^-4

1 × 10^-5

1 × 10^-10

1.435 × 10^-5

108 × 10^-3

0.05 M Na₂ CO₃

0.05 M AgNO₃

0.05 M NH₃

[Ca²⁺][PO₄^3-]²

[Ca²⁺]³ [PO₄^3-]

[Ca²⁺][PO₄^3-]

[Ca²⁺]³ [PO₄^3-]²

S = (K_SP 1/28)^1/4

S = (128 K_SP)^1/4

S = (256 K_SP)^1/5

S = (K_SP/256)^1/5