Electrochemistry Test

Result

Electrochemistry Test - 7

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Weekly Quiz Competition

Question 1
1 / -0.25

The specific conductance of a solution is 0.3568 ohm^-1 . When placed in a cell the conductance is 0.0268 ohm^-1 . The cell constant is-

A
1.331 cm^-1

B
13.31 cm^-1

C
0.665 cm^-1

D
6.65 cm^-1

Solution

K = 0.3568 W cm^–1
condutance = 0.0268 Ω^–1
K = G ×1/A
0.3568 = 0.0268 ×1/9
13.31 cm^–1
Question 2
1 / -0.25

A conductance cell was filled with a 0.02 M KCl solution which has a specific conductance of 2.768 ×10 ^{- 3} ohm ^{- 1} cm ^{- 1} . If its resistance is 82.4 ohm at 25 ºC, the cell constant is-

A
0.2182 cm^-1

B
0.2281 cm^-1

C
0.2821 cm^-1

D
0.2381 cm^-1

Solution

K = G. L/A
10^–3 ×2.768 = 1/R ×L/A
L/A = 228.08 ×10^–3
= 0.2281 cm –1
Question 3
1 / -0.25

The variation of equivalent conductance vs decrease in concentration of a strong electrolyte is correctly given in the plot -

A
A

B
A

C
A

D
A

Solution

On decreasing the value of M will increase but increase will be hyberbolic.
Question 4
1 / -0.25

Which of the following solutions has the highest equivalent conductance ?

A
0.01M NaCl

B
0.050 M NaCl

C
0.005M NaCl

D
0.02M NaCl

Solution

Higher the dilution higher will be the equivalent conductance
Question 5
1 / -0.25

The resistance of 0.01N solution of an electrolyte AB at 328K is 100 ohm. The specific conductance of solution is (cell constant = 1cm^-1 ) -

A
100 ohm

B
10^-2 ohm^-1

C
10^-2 ohm^-1 cm^-1

D
10² ohm-cm

Solution
Question 6
1 / -0.25

For an electrolytic solution of 0.05 mol L^-1 , the conductivity has been found to be 0.0110 Scm^-1 .The molar conductivity is-

A
0.055 S cm² mol^-1

B
550 S cm² mol^-1

C
0.22 S cm² mol^-1

D
220 S cm² mol^-1

Solution
Question 7
1 / -0.25

Two electrodes are fitted in conductance cell 1.5 cm apart while the area of cross section of each electrode is 0.75 cm² . The cell constant is-

A
1.125

B
0.5 cm

C
2.0 cm^-1

D
0.2 cm^-1

Solution

L/A is cell constant.
Question 8
1 / -0.25

The best conductor of electricity is in 1M solution of-

A
CH₃ COOH

B
H₂ SO₄

C
H₃ PO₄

D
Boric acid

Solution

That electrolyte will be the best electrolyte which has maximum number of ions.
Question 9
1 / -0.25

A certain current liberates 0.504 g of H₂ in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in CuSO₄ solution -

A
31.8 g

B
16.0 g

C
12.7 g

D
63.5 g

Solution

gm eq. of H₂ = gm eq. of Cu
Question 10
1 / -0.25

A currnet of 2.6 ampere is passed through CuSO₄ solution for 6 minutes 20 seconds. The amount of Cu deposited is (At. wt. of Cu = 63.5, Faraday = 96500 C)-

A
6.35 g

B
0.635 g

C
0.325 g

D
3.175 g

Solution