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Electrochemistry and Electroplating (Class X)

Covers electrolysis, Faraday's laws, electroplating, and electrochemical cells for Class X students

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

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.
Question 2 Multiple Choice (Single Answer)

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)
Question 3 Multiple Choice (Single Answer)

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
Question 4 Multiple Choice (Single Answer)

One faraday is equal to

  1. 69,500 coulombs
  2. 91,500 coulombs
  3. 91,400 coulombs
  4. 96,500 coulombs
Question 5 Multiple Choice (Single Answer)

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
Question 6 Multiple Choice (Single Answer)

Cells have _______ rods and _______ caps.

  1. metal, copper
  2. copper, carbon
  3. carbon, metal
  4. metal, carbon
Question 7 Multiple Choice (Single Answer)

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)
Question 8 Multiple Choice (Single Answer)

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)
Question 9 Multiple Choice (Single Answer)

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
Question 10 Multiple Choice (Single Answer)

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.
Question 11 Multiple Choice (Single Answer)

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
Question 12 Multiple Choice (Single Answer)

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
Question 13 Multiple Choice (Single Answer)

Electroplating is mostly done on

  1. gold
  2. chromium
  3. zinc
  4. iron
Question 14 Multiple Choice (Single Answer)

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.
Question 15 Multiple Choice (Single Answer)

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)
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