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Chemical Effects of Current - 1 (Class X)

Chemical Effects of Current - 1

13 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)

Cells have _______ rods and _______ caps.

  1. metal, copper
  2. copper, carbon
  3. carbon, metal
  4. metal, carbon
Question 4 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 5 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 6 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 7 Multiple Choice (Single Answer)

Why does a brand new bicycle have a shining handlebar and wheel rims?

(a) Due to electroplating
(b) Due to electrofluorescence
(c) Due to electrolysis

  1. Only (a)
  2. Both (b) and (c)
  3. Both (a) and (c)
  4. Both (a) and (b)
Question 8 Multiple Choice (Single Answer)

The conductivity of the electrolyte used in the purification of copper can be increased by adding ______ to the solution.

  1. dilute hydrochloric acid
  2. dilute hydrosulphuric acid
  3. dilute sulphuric acid
  4. dilute chloric acid
Question 9 Multiple Choice (Single Answer)

Why are cans used for storing food made of electroplated tin instead of iron?

  1. Tin is more reactive than iron.
  2. Tin is less reactive than iron.
  3. Tin reacts with food to prevent spoiling.
  4. Tin absorbs oxygen from the air, thereby preventing oxidation of food.
Question 10 Multiple Choice (Single Answer)

What type of electroplating is done on objects of gold?

  1. Chromium plating
  2. Zinc plating
  3. Silver plating
  4. No plating is done on gold
Question 11 Multiple Choice (Single Answer)

An electric dry cell has _____ on one side.

  1. metal disc
  2. metal wire
  3. plastic base
  4. filament
Question 12 Multiple Choice (Single Answer)

Which of the following statements is true for the purification of copper?

  1. A pure copper rod is connected to the positive terminal of the battery and copper sulphate solution is the electrolyte.
  2. A pure copper rod is connected to the positive terminal of the battery and distilled water is the electrolyte.
  3. An impure copper rod is connected to the positive terminal of the battery and salty water is the electrolyte.
  4. An impure copper rod is connected to the positive terminal of the battery and copper sulphate solution is the electrolyte.
Question 13 Multiple Choice (Single Answer)

Why is zinc-coated iron used in bridges?

  1. Zinc gives shiny appearance to iron.
  2. Zinc increases the strength of the structure.
  3. Zinc reacts with iron to produce an alloy which is less affected by temperature change, thereby preventing the structure from developing cracks.
  4. Zinc protects iron from rusting.
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