• Electricity - 2 (Class X)
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Electricity - 2 (Class X)

Description: Electricity - 2
Number of Questions: 15
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Tags: Electricity - 2 Electrolysis Faraday-s Laws Electroplating Electrochemical Cell and Dry Cell
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Which of the following statements is/are true?

(a) The passage of electric current through a conducting solution can cause chemical reaction. (b) The passage of electric current through a conducting solution can cause physical reaction.

  1. Only (a) is true.

  2. Only (b) is true.

  3. Both (a) and (b) are true.

  4. Both (a) and (b) are false.

Show answer
Correct Option: C
Explanation:

The passage of electric current through a conducting solution can cause physical as well as chemical changes. Chemical changes are more obvious because they are easier to detect. However, passage of current also heats up the liquid, which is a physical phenomenon.

Which of the following statements about electrolysis is true?

(a) The reaction depends on the solution only. (b) The reaction depends on the electrodes only. (c) The reaction depends on both the solution and the electrodes. (d) The reaction depends niether on the electrodes nor the solution.

  1. Only (a)

  2. Only (b)

  3. Only (c)

  4. Only (d)

Show answer
Correct Option: C
Explanation:

The reaction depends on both the solution and the electrodes.

Two faradays of electric current can produce

  1. 20 g of calcium from calcium sulphate

  2. 81 g of aluminium from aluminium oxide

  3. 48 g of magnesium from magnesium chloride

  4. 2 g of hydrogen gas from aqueous hydrogen chloride

  5. 35.5 g of chlorine gas from aqueous hydrogen chloride

Show answer
Correct Option: D
Explanation:

Two faradays of electric current can produce 2 g (1 mole of hydrogen) of hydrogen gas.

One faraday is equal to

  1. 69,500 coulombs

  2. 91,500 coulombs

  3. 91,400 coulombs

  4. 96,500 coulombs

Show answer
Correct Option: D
Explanation:

One faraday is equal to 96,500 coulombs.

Faraday’s laws of electrolysis are related to the

  1. atomic number of the cation

  2. atomic number of the anion

  3. equivalent weight of the electrolyte

  4. speed of the cation

Show answer
Correct Option: C
Explanation:

The mass of a substance altered at an electrode during electrolysis is directly proportional to the quantity of electricity transferred at that electrode. Quantity of electricity refers to the quantity of electrical charge, typically measured in coulomb. For a given quantity of DC electricity (electric charge), the mass of an elemental material altered at an electrode is directly proportional to the element's equivalent weight.

Cells have _______ rods and _______ caps.

  1. metal, copper

  2. copper, carbon

  3. carbon, metal

  4. metal, carbon

Show answer
Correct Option: C
Explanation:

Electric cells have carbon rods and metal caps.

According to Faraday’s first law, the amount of substance deposited at electrode when an electric current is passed through an electrolyte depends upon the

(a) amount of current passed (b) dissociation of electrolyte (c) time till which current is passed (d) nature of electrode material

  1. Both (a) and (b)

  2. Both (b) and (c)

  3. Both (a) and (c)

  4. Both (c) and (d)

Show answer
Correct Option: C
Explanation:

According to Faraday’s first law, the amount of substance deposited at electrode when an electric current is passed through an electrolyte depends upon the amount of current passed and the time till which current is passed.

What do you mean by electroplating?

(a) The process of decomposition of any desired metal into another metal by means of electricity (b) The process of decomposition of any desired metal into another metal by means of physical reaction (c) The process of depositing a layer of any desired metal on another material by means of electricity

  1. Only (a)

  2. Only (b)

  3. Only (c)

  4. Both (a) and (b)

Show answer
Correct Option: C
Explanation:

The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating.

An electrochemical cell stops working after some time because

  1. one of the electrodes is eaten away

  2. electrode potentials of both the electrodes become equal in magnitude, but opposite in signs

  3. electrode potentials of both the electrodes go on decreasing

  4. electrode potentials of both the electrodes go on increasing

  5. None of these

Show answer
Correct Option: B
Explanation:

An electrochemical cell stops working after some time because electrode potentials of both the electrodes become equal in magnitude, but opposite in signs.

We have distilled water in two plastic bottles labelled A and B. We add hydrochloric acid to the water in bottle A and caustic soda to the water in bottle B. Which of the following will hold true?

  1. The solutions in both the bottles will conduct electricity.

  2. Only the solution in bottle A will conduct electricity.

  3. Only the solution in bottle B will conduct electricity.

  4. The solutions in both the bottles will not conduct electricity.

Show answer
Correct Option: A
Explanation:

The solution in bottle A is acidic and the solution in bottle B is basic. Both acids and bases dissociate into ions in water. So, both the solutions conduct electricity when an electric current is passed through them.

During electroplating, when current is passed through a copper sulphate solution, copper gets deposited on the

  1. electrode which is attached to the negative terminal of the battery

  2. electrode which is attached to the positive terminal of the battery

  3. walls of the vessel

  4. bottom of the vessel

Show answer
Correct Option: A
Explanation:

When electric current is passed through copper sulphate solution, copper sulphate dissociates into copper and sulphate ions. The free copper ions get drawn to the electrode connected to the negative terminal of the battery and gets deposited on it. 

Why is electroplating done on metallic objects?

  1. To make the metal reactive

  2. To make the appearance of the metal dull

  3. To change the composition of the metal

  4. To protect the metal underneath and to make it attractive

Show answer
Correct Option: D
Explanation:

Metallic objects are electroplated to protect the metal underneath and to make it attractive.

Electroplating is mostly done on

  1. gold

  2. chromium

  3. zinc

  4. iron

Show answer
Correct Option: D
Explanation:

Electroplating is mostly done on iron to prevent its corrosion and also to improve the looks of the object.

Mohit took a piece of potato and inserted both ends of a copper wire into it. He connected the wire to a battery. Some change happened after some time in the piece. What is that change?

  1. A coloured spot is formed on the potato on the side of negative terminal.

  2. A coloured spot is formed on the potato on the side of positive terminal.

  3. The whole upper surface of the potato becomes coloured.

  4. The colour of the copper wire changes.

Show answer
Correct Option: B
Explanation:

A coloured spot is formed on one terminal of the potato, which is the positive terminal.

Why is chromium used for electroplating?

(a) It does not corrode. (b) It is scratch resistant. (c) It is cheap, easily available and can be electroplated very easily.

  1. Only (a)

  2. Both (a) and (b)

  3. Only (c)

  4. Both (b) and (c)

Show answer
Correct Option: B
Explanation:

Chromium does not corrode and is scratch resistant. Chromium is neither cheap nor is it easily available. Electroplating of chromium is a complex and controlled process as the chromium layer tends to peel off.

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