Electrochemistry Test

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Electrochemistry Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

The one which decreases with dilution is

A
molar conductance

B
conductance

C
specific conductance

D
equivalent conductance
Question 2
4 / -1

Which one of the following solutions will have highest conductivity?

A
0.01 M CH₃ COOH

B
0.1 M NaCl

C
0.1 M KNO₃

D
0.1 M HCl
Question 3
4 / -1

Which of the following does not conduct electricity?

A
Fused NaCl

B
Solid NaCl

C
Brine solution

D
Copper
Question 4
4 / -1

What is the effect of dilution on the equivalent conductance of strong electrolyte ?

A
Decreases on dilution

B
Remains unchanged

C
Increases on dilution

D
None of these
Question 5
4 / -1

The resistance of 1N solution of acetic acid is 250Ω, when measured in a cell having a cell constant of 1.15 cm^-1. The equivalent conduction (in ohm^-1 cm² equiv^-1) of 1N acetic acid is

A
2.3

B
4.6

C
9.2

D
18.4

Solution
Question 6
4 / -1

Given the limiting molar conductivity as
˄⁰_m (HCl) = 425.9Ω^-1 cm² mol^-1
˄⁰_m (NaCl) = 126.4Ω^-1 cm² mol^-1
˄⁰_m (CH₃ COONa) = 91Ω^-1 cm² mol^-1
The molar conductivity, at infinite dilution, of acetic acid (in Ω^-1 cm² mol^-1
) will be

A
481.5

B
390.5

C
299.5

D
516.9

Solution
Question 7
4 / -1

Which of the following electrolytic solutions has the least specific conductance?

A
0.02 N

B
0.2 N

C
2 N

D
0.002 N
Question 8
4 / -1

Given. l/a = 0.5 cm^-1, R = 50 ohm, N = 1.0 . The equivalent conductance of the electrolytic cell is

A
10 Ω^-1 cm² g equiv^-1

B
20 Ω^-1 cm² g equiv^-1

C
300 Ω^-1 cm² g equiv^-1

D
100 Ω^-1 cm² g equiv^-1

Solution
Question 9
4 / -1

Impure copper containing Fe, Au, Ag as impurities is electrolytically refined. A current of 140 A for 482.5s and decreased the mass of the anode by 22.26 g and increased the mass of cathode by 22.011 g percentage of iron in impure copper is (given molar mass Fe = 55.5 g / mol; molar mass of Cu = 63.54 g/mol)

A
0.95

B
0.85

C
0.97

D
0.9

Solution
Question 10
4 / -1

When 9.65 C of elecricity is passed through a solution of silver nitrate (atomic mass of Ag =108 g mol^-1) , the amount of silver deposited is

A
16.2 mg

B
21.2 mg

C
10.8 mg

D
6.4 mg

Solution

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Electrochemistry Test - 7

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Electrochemistry Test - 7

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Question 1

molar conductance

conductance

specific conductance

equivalent conductance

Question 2

0.01 M CH3 COOH

0.1 M NaCl

0.1 M KNO3

0.1 M HCl

Question 3

Fused NaCl

Solid NaCl

Brine solution

Copper

Question 4

Decreases on dilution

Remains unchanged

Increases on dilution

None of these

Question 5

2.3

4.6

9.2

18.4

Solution

Question 6

481.5

390.5

299.5

516.9

Solution

Question 7

0.02 N

0.2 N

2 N

0.002 N

Question 8

10 Ω-1 cm2 g equiv-1

20 Ω-1 cm2 g equiv-1

300 Ω-1 cm2 g equiv-1

100 Ω-1 cm2 g equiv-1

Solution

Question 9

0.95

0.85

0.97

0.9

Solution

Question 10

16.2 mg

21.2 mg

10.8 mg

6.4 mg

Solution

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0.01 M CH₃ COOH

0.1 M KNO₃

10 Ω^-1 cm² g equiv^-1

20 Ω^-1 cm² g equiv^-1

300 Ω^-1 cm² g equiv^-1

100 Ω^-1 cm² g equiv^-1