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Chemical Effect of Electric Current (Set - II)

Chemical Effect of Electric Current - II

15 Questions Published
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Questions

Question 1 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 2 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 3 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 4 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 5 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 6 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 7 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 8 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.
Question 9 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 10 Multiple Choice (Single Answer)

Which of the following is a poor conductor of electricity?

  1. Alcohol
  2. Common salt solution
  3. Copper sulphate solution
  4. Aqueous solution of HCl
Question 11 Multiple Choice (Single Answer)

The solution that does not allow electricity to pass through it is called _________ and the solution that allows electricity to pass through it is called ________.

  1. insulator, conductor
  2. conductor, insulator
  3. resistor, conductor
  4. insulator, resistor
Question 12 Multiple Choice (Single Answer)

A tester is used to check the conduction of electricity through 2 liquids labelled A and B. It is found that the bulb of the tester glows brightly for liquid A, while it glows very dimly for liquid B. What conclusion can be drawn?

  1. Liquid B is a better conductor than liquid A.
  2. Liquid A is a better conductor than liquid B.
  3. Both liquids are equally good conductors.
  4. No conclusion can be drawn.
Question 13 Multiple Choice (Single Answer)

Why are gas bubbles produced sometimes when electric current is passed through a conducting solution?

  1. Because passage of electric current causes physical changes, thereby reducing pressure inside the solutions
  2. Because passage of electric current causes chemical reactions, which lead to release of gases
  3. Because passage of electric current causes magnetic effects in the solution, leading to bubbble formation
  4. Because passage of electric current decreases the temperature of the conducting solution
Question 14 Multiple Choice (Single Answer)

A child has two beakers. In the first beaker, he poured some drinking water and in the other, he poured some seawater. He tests the solutions with a tester and compass needle. In which case will the compass needle deflect more?

  1. The beaker with drinking water will show more deflection.
  2. Both the beakers will show the same deflection.
  3. The beaker with seawater will show more deflection.
  4. The beaker with seawater will show no deflection.
Question 15 Multiple Choice (Single Answer)

What will happen to the conductivity of the solution when seawater is added to distilled water?

  1. No effect will be observed.
  2. There will be a voltage difference between the top and the bottom of the beaker.
  3. It will become a good conductor of electricity.
  4. The seawater settles at the bottom. So, the bottom half of the solution will be conducting and the top half won't be.
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