Chemical Equilibrium Test

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Chemical Equilibrium Test - 20

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Weekly Quiz Competition

Question 1
4 / -1

20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will

A
be neutral

B
be basic

C
turn phenolphthalein solution pink

D
turn methyl orange red
Question 2
4 / -1

The pH of an aqueous solution having hydroxide ion concentration as 1 x 10^-5 is

A
5

B
9

C
4.5

D
11
Question 3
4 / -1

An aqueous solution of 1 M NaCl and 1 M HCl is

A
not a buffer but pH < 7

B
not a buffer but pH > 7

C
a buffer with pH < 7

D
a buffer with pH > 7
Question 4
4 / -1

The solubility product of Ag₂ Cr O₄ is 32 x 10^-2. What is the concentration of CrO₄^- ions in that solution?

A
2 × 10^-4 M

B
16 × 10^-4 M

C
8 × 10^-4 M

D
8 × 10^-8 M

Solution
Question 5
4 / -1

What will be solubility product of Ca(OH)₂ if its solubility is √3 ?

A
3

B
3√3

C
12√3

D
27
Question 6
4 / -1

Which of the following salts has the greatest molar solubility in pure water?

A
CaCO₃ (K_SP = 8.7 x 10^-9 )

B
CuS (K_SP = 8.5 x 10^-45)

C
Ag₂CO₃ (K_SP = 6.2 x 10^-12 )

D
Pb₉IO₃ (K_SP = 2.6 x 10^-13 )
Question 7
4 / -1

Given the K_SP expression. K_SP = [A³⁺]² [B^2-]³

A
A₂B₃ (s) ⟺ 3A³⁺ (aq) + 2B^2- (aq)

B
A₂B₃ (s) ⟺ 3A³⁺ (aq) + 3B^2- (aq)

C
A₃B₂ (s) ⟺ 3A³⁺ (aq) + 2B^2- (aq)

D
A₃B₂ (s) ⟺ 2A³⁺ (aq) + 3B^2- (aq)
Question 8
4 / -1

The solubility product of a binary weak electrolyte is 4 × 10^-10 at 298 K. Its solubility (in mol dm^-3) at the same temperature is

A
4 × 10^-5

B
2 × 10^-5

C
8 × 10^-10

D
16 × 10^-20

Solution
Question 9
4 / -1

The solubility of CaF₂ is s mol/L. Then, solubility product is

A
S²

B
4S³

C
4S²

D
S³
Question 10
4 / -1

H₂S is passed into 1 dm³ of a solution containing 0.1 mole of Zn²⁺ and 0.01 mole of Cu²⁺ till the sulphide ion concentration reaches 8.1 × 10^-19 mole. Which one of the following statement is correct ?
(K_SP of ZnS and CuS are 3 × 10^-22 and 8 × 10^-36, respectively)

A
Only ZnS precipitates

B
Both CuS and ZnS precipitate

C
Only CuS precipitates

D
No precipitation occurs

Solution

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Re-Attempt Weekly Quiz Competition

Chemical Equilibrium Test - 20

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Chemical Equilibrium Test - 20

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Question 1

be neutral

be basic

turn phenolphthalein solution pink

turn methyl orange red

Question 2

5

9

4.5

11

Question 3

not a buffer but pH < 7

not a buffer but pH > 7

a buffer with pH < 7

a buffer with pH > 7

Question 4

2 × 10-4 M

16 × 10-4 M

8 × 10-4 M

8 × 10-8 M

Solution

Question 5

3

3√3

12√3

27

Question 6

CaCO3 (KSP = 8.7 x 10-9 )

CuS (KSP = 8.5 x 10-45)

Ag2CO3 (KSP = 6.2 x 10-12 )

Pb9IO3 (KSP = 2.6 x 10-13 )

Question 7

A2B3 (s) ⟺ 3A3+ (aq) + 2B2- (aq)

A2B3 (s) ⟺ 3A3+ (aq) + 3B2- (aq)

A3B2 (s) ⟺ 3A3+ (aq) + 2B2- (aq)

A3B2 (s) ⟺ 2A3+ (aq) + 3B2- (aq)

Question 8

4 × 10-5

2 × 10-5

8 × 10-10

16 × 10-20

Solution

Question 9

S2

4S3

4S2

S3

Question 10

Only ZnS precipitates

Both CuS and ZnS precipitate

Only CuS precipitates

No precipitation occurs

Solution

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2 × 10^-4 M

16 × 10^-4 M

8 × 10^-4 M

8 × 10^-8 M

CaCO₃ (K_SP = 8.7 x 10^-9 )

CuS (K_SP = 8.5 x 10^-45)

Ag₂CO₃ (K_SP = 6.2 x 10^-12 )

Pb₉IO₃ (K_SP = 2.6 x 10^-13 )

A₂B₃ (s) ⟺ 3A³⁺ (aq) + 2B^2- (aq)

A₂B₃ (s) ⟺ 3A³⁺ (aq) + 3B^2- (aq)

A₃B₂ (s) ⟺ 3A³⁺ (aq) + 2B^2- (aq)

A₃B₂ (s) ⟺ 2A³⁺ (aq) + 3B^2- (aq)

4 × 10^-5

2 × 10^-5

8 × 10^-10

16 × 10^-20

S²

4S³

4S²

S³