Chemical Effects of Electric Current Quiz - CBSE Class 8 Science

Free practice quiz: Chemical Effects of Electric Current (CBSE Class 8 Science). 15 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 8 Science practice quiz has 15 multiple-choice questions on Chemical Effects of Electric Current, and 15 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is NOT a chemical effect of electric current?

   1. Electroplating
   2. Electrolysis
   3. Heating of a wire
   4. Corrosion of metals
   Show answer

   Answer: C. Heating of a wire

   Heating of a wire is a heating effect, not a chemical effect. Electroplating, electrolysis, and corrosion of metals are all chemical changes caused by electric current.

2. What is the electrolyte in a simple electrolytic cell?

   1. A solid conductor
   2. An insulator
   3. A solution that conducts electricity
   4. A vacuum
   Show answer

   Answer: C. A solution that conducts electricity

   An electrolyte is a substance that conducts electricity when dissolved in water or molten.

3. How does the concentration of the electrolyte affect the rate of electroplating?

   1. Higher concentration leads to faster plating
   2. Lower concentration leads to faster plating
   3. Concentration has no effect
   4. It depends on the type of electrolyte
   Show answer

   Answer: A. Higher concentration leads to faster plating

   A higher concentration of ions in the electrolyte means more ions are available for reduction at the cathode, leading to a faster plating rate.

4. What are the necessary components for an electrolytic cell to function?

   1. Electrolyte, electrodes, power source
   2. Electrolyte, electrodes
   3. Electrodes, power source
   4. Electrolyte, power source
   Show answer

   Answer: A. Electrolyte, electrodes, power source

   All three are essential: an electrolyte to conduct electricity, electrodes for the reaction and power source to drive the current

5. How does changing the current strength affect the rate of electrolysis?

   1. Higher current, faster electrolysis
   2. Higher current, slower electrolysis
   3. No effect
   4. Depends on the electrolyte
   Show answer

   Answer: A. Higher current, faster electrolysis

   A stronger current means more charge flows through the cell, leading to a faster rate of electrochemical reactions.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What process uses electric current to coat a metal object with another metal?
2. During electrolysis, what happens at the cathode?
3. Explain how electroplating works at a molecular level, including the roles of ions and electrons.
4. A student sets up an electrolysis experiment using copper electrodes and copper sulfate solution. What will be observed at the cathode?
5. What is the difference between an anode and a cathode?
6. Which type of reaction occurs at the anode during electrolysis?
7. Give an example of a practical application of electrolysis.
8. Why is an electrolyte essential in an electrolytic cell?
9. Describe the role of ions in electrolysis.
10. Explain how corrosion is related to the chemical effects of electricity.

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