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Chemical Effects of Current - 2 (Class X)

Chemical Effects of Current - 2

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Questions

Question 1 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 2 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 3 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 4 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 5 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 6 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 7 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 8 Multiple Choice (Single Answer)

Electroplating is mostly done on

  1. gold
  2. chromium
  3. zinc
  4. iron
Question 9 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)
Question 10 Multiple Choice (Single Answer)

An electric dry cell has _____ on one side.

  1. metal disc
  2. metal wire
  3. plastic base
  4. filament
Question 11 Multiple Choice (Single Answer)

Which of the following statements is true about electrochemical cells?

  1. Oxidation takes place at cathode and reduction takes place at anode.
  2. Cathode is negative and anode is positive.
  3. Electrons flow from anode to cathode in the external circuit.
  4. Electrical energy is converted into chemical energy.
Question 12 Multiple Choice (Single Answer)

For the process of electrolysis of water, which of the following statements is true?

  1. Oxygen bubbles will be formed on positive electrode and hydrogen bubbles will be formed on negative electrode.
  2. Oxygen bubbles will be formed on negative electrode and hydrogen bubbles will be formed on positive electrode.
  3. Oxygen and hydrogen bubbles will be formed on positive electrode only.
  4. Oxygen and hydrogen bubbles will be formed on negative electrode only.
Question 13 Multiple Choice (Single Answer)

A test lamp glows while testing the conductivity of a liquid. What does it show?

  1. It shows that electric current can never pass through liquids.
  2. It shows that the liquid is distilled water.
  3. It shows that electric current can pass through liquids.
  4. It shows that the circuit is incomplete.
Question 14 Multiple Choice (Single Answer)

The mass of a product liberated at anode in an electrochemical cell depends on

  1. (It)1/2
  2. It
  3. I/t
  4. I2t
Question 15 Multiple Choice (Single Answer)

If we cut out a piece of potato and insert copper wire of a tester into it, what effect will be observed?

  1. A red spot is formed on one terminal of the wire.
  2. A greenish-blue spot is formed on one terminal of the wire.
  3. A bluish-black spot is formed on one terminal of the wire.
  4. A greenish-blue spot is formed on both terminals of the wire.
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