• Chemical Effects of Current - 1 (Class X)
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Chemical Effects of Current - 1 (Class X)

Description: Chemical Effects of Current - 1
Number of Questions: 15
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Tags: Chemical Effects of Current - 1 Heat and Temperature Laboratory and Clinical Thermometer Laws of Faraday Electrolysis Electroplating Electrochemical Cell and Dry Cell
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Match the following:

     
a. Torch 1. Wet battery
b. Electric bell 2. Metal plate
c. Car 3. Dry cell
d. Electric iron 4. Hammer

  1. a - 1, b - 4, c - 3, d - 2

  2. a - 3, b - 4, c - 1, d - 2

  3. a - 3, b - 2, c - 4, d - 1

  4. a - 3, b - 1, c - 4, d - 2

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct as all are matched correctly. 

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.

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.

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.

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 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)

Show answer
Correct Option: A
Explanation:

The iron handle bar and the wheelrims of a cycle are electroplated with nickel or other metals to prevent corrosion and and give it a shiny appearance.

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

Show answer
Correct Option: C
Explanation:

Dilute sulphuric acid can increase the conductivity of copper sulphate solution used for electroplating.

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.

Show answer
Correct Option: B
Explanation:

Tin is less reactive than iron and does not react with the food.

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

Show answer
Correct Option: D
Explanation:

No plating is done on gold.

Match the following:

 
Example Conversion of energy
1. Electric bulb A. Chemical energy to electrical energy
2. Door bell B. Electrical energy to light energy
3. Dry cell C. Electrical energy to heat energy
4. Electric iron D. Electrical energy to sound energy

  1. 1 - B, 2 - C, 3 - A, 4 - D

  2. 1 - B, 2 - D, 3 - C, 4 - A

  3. 1 - B, 2 - D, 3 - A, 4 - C

  4. 1 - C, 2 - D, 3 - B, 4 - A

  5. 1 - C, 2 - D, 3 - A, 4 - B

Show answer
Correct Option: C
Explanation:

This is the right answer. Electric bulb converts electrical energy to light energy. Door bell converts electrical energy to sound energy. Dry cell converts chemical energy to electrical energy and electric iron converts electrical energy to heat energy.

An electric dry cell has _____ on one side.

  1. metal disc

  2. metal wire

  3. plastic base

  4. filament

Show answer
Correct Option: A
Explanation:

An electric dry cell has metal disc on one side.

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.

Show answer
Correct Option: D
Explanation:

In the purification of copper, an impure copper rod is connected to the positive terminal, pure copper rod is connected to the negative terminal and an aqueous solution of a copper salt, usually copper sulphate, is used.

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.

Show answer
Correct Option: D
Explanation:

Zinc protects iron from rusting.

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