Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 10

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Weekly Quiz Competition

Question 1
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Which of the following statements is incorrect regarding electroplating?

A
It represents the chemical effect of an electric current

B
It involves the deposition of one metal over another

C
It provides protection from magnetism

D
It protects an object from corrosion

Solution

Electroplating protects a substance by cutting its direct contact from the action of air and moisture. However, it does not affect the magnetic properties of that substance.

The correct answer is C.
Question 2
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Use the following information to answer the next question.

Formation of gas bubbles and a colour change is observed when electric current is passed through a conductor dipped in a solution containing free ions.

Formation of gas bubbles and a colour change is observed because of the

A
thermal effect

B
chemical effect

C
magnetic effect

D
mechanical effect

Solution

Chemical effect is defined as a change produced in a system due to a change in the chemical composition of the substances present in it. The change is indicated by activities such as colour change, formation of gas bubbles, deposition of metal, etc. Hence, the formation of gas bubbles and colour change (as observed in the given experiment) is a result of the chemical effect produced by the passage of the electric current.

The correct answer is B.
Question 3
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Which of the following substances does not conduct electricity?

A
Iron

B
Copper

C
Lemon juice

D
Distilled water

Solution

Distilled water does not conduct electricity as it does not contain free ions. Hence, distilled water is a bad conductor of electricity.

The correct answer is D.
Question 4
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Which of the given statements is incorrect?

A
Air is a perfect insulator

B
Wood is a good insulator

C
Vinegar is a poor conductor

D
Aluminium is a good conductor

Solution

An insulator is a non-conducting substance. It does not allow current to pass through it under any condition. Air is not a perfect insulator. It is rather a poor conductor since at high temperature, the molecules present in air get ionized and start conducting electricity. During lightning, electric current passes through air.

The correct answer is A.
Question 5
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Which of the following examples represents the chemical effect of current?

A
Glowing of a bulb

B
Ringing of an electric bell

C
Plating of tin on iron articles

D
Deflection of a compass needle

Solution

Deposition of tin on iron articles is done by the process of electroplating. A chemical change takes place during this process. The positive tin ions get deposited on the iron plates that are connected to the negative terminal of the battery. Hence, electroplating is an example of the chemical effect of current.

The correct answer is C.