Chemical Effects of Current Test

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Chemical Effects of Current Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Why is the electrolytic cell made of silica during the electrolysis of molten lead bromide?

A
Because it is non-reactive

B
Because it is a good conductor of electricity

C
Because it helps discharge the ions

D
Because it absorbs the fumes evolved during the process

Solution

The electrolytic cell is made of silica during the electrolysis of molten lead bromide because it is non-reactive.
Question 2
1 / -0

Which of the following is preferred as anode to other inert electrodes?

A
Platinum

B
Iron

C
Graphite

D
Silica

Solution

Graphite is preferred as anode to other inert electrodes such as platinum since graphite is unaffected by reactive bromine vapours.
Question 3
1 / -0

Which of the following is called anode mud?

A
Insoluble impurities

B
Thin strips of pure metal

C
Electrode used in the process

D
Electrolyte used in the process

Solution

In electrolytic refining, anode is made from impure metal and cathode is made from pure metal. When electricity is passed, the pure metal present in the anode goes and sticks to the cathode, and the impurities left behind settle down the anode. This is called anode mud.
Question 4
1 / -0

Which metals are used as cathode and anode during electrolysis of sodium metal?

A
Iron as cathode and graphite rod as anode.

B
Sodium as anode and iron as cathode.

C
Graphite rod as cathode and impure sodium as anode.

D
Iron as cathode and lead as anode.

Solution

Iron metal is used as cathode and graphite rod is used as anode during electrolysis of sodium metal.
Question 5
1 / -0

Which of the following is called an electrolyte during electrolysis of fused lead bromide?

A
Silica

B
Molten lead bromide

C
Graphite

D
Iron

Solution

Molten lead bromide acts as the electrolyte during electrolysis of fused lead bromide.
Question 6
1 / -0

What is the amount of sodium produced by passage of 2 moles of electrons in the electrolysis of fused NaCl?

A
23 g

B
46 g

C
11.5 g

D
34.5 g

Solution

We get one mole of sodium for every mole of electrons. Thus, 46 g (2 moles) of sodium is produced when 2 moles of electrons is passed in the electrolysis of fused NaCl.
Question 7
1 / -0

Which of the following statements about electroplating is incorrect?

A
The article to be electroplated is always placed at the anode.

B
A low current should be passed for a longer period of time.

C
Direct current should be used.

D
The metal to be electroplated has to be periodically replaced.

Solution

The article to be electroplated is always placed at the cathode.
Question 8
1 / -0

Which of the following processes is used for purifying metals by electrolysis?

A
Electroplating

B
Electrorefining

C
Electrometallurgy

D
Electrodeposition

Solution

Electrorefining is used for purifying metals by electrolysis.

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Chemical Effects of Current Test - 2

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Chemical Effects of Current Test - 2

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Question 1

Because it is non-reactive

Because it is a good conductor of electricity

Because it helps discharge the ions

Because it absorbs the fumes evolved during the process

Solution

Question 2

Platinum

Iron

Graphite

Silica

Solution

Question 3

Insoluble impurities

Thin strips of pure metal

Electrode used in the process

Electrolyte used in the process

Solution

Question 4

Iron as cathode and graphite rod as anode.

Sodium as anode and iron as cathode.

Graphite rod as cathode and impure sodium as anode.

Iron as cathode and lead as anode.

Solution

Question 5

Silica

Molten lead bromide

Graphite

Iron

Solution

Question 6

23 g

46 g

11.5 g

34.5 g

Solution

Question 7

The article to be electroplated is always placed at the anode.

A low current should be passed for a longer period of time.

Direct current should be used.

The metal to be electroplated has to be periodically replaced.

Solution

Question 8

Electroplating

Electrorefining

Electrometallurgy

Electrodeposition

Solution

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