Electrochemistry Quiz - CBSE Class 12 Chemistry

Free practice quiz: Electrochemistry (CBSE Class 12 Chemistry). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Chemistry practice quiz has 19 multiple-choice questions on Electrochemistry, and 19 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. What is the standard electrode potential of a hydrogen electrode?

   1. 0 V
   2. -1.07 V
   3. 1.23 V
   4. 0.8 V
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   Answer: A. 0 V

   The standard electrode potential of a hydrogen electrode, which is used as a reference, is defined to be 0 V.

2. What is the Nernst equation used for in electrochemistry?

   1. To calculate reaction rates
   2. To determine cell potential under non-standard conditions
   3. To find molarity
   4. To analyze gas laws
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   Answer: B. To determine cell potential under non-standard conditions

   The Nernst equation relates the cell potential of an electrochemical cell to the concentrations of reactants and products, thus applying to non-standard conditions.

3. What happens to the charge of anions at the anode during electrolysis?

   1. They gain electrons
   2. They lose electrons
   3. They remain unchanged
   4. They combine
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   Answer: B. They lose electrons

   At the anode in electrolysis, anions lose electrons during oxidation, which is a characteristic of the electrochemical process.

4. What is the main product of the electrolysis of molten sodium chloride?

   1. Sodium hydroxide
   2. Sodium metal
   3. Chlorine gas
   4. Sodium chloride
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   Answer: B. Sodium metal

   Electrolysis of molten sodium chloride yields sodium metal at the cathode and chlorine gas at the anode.

5. What does the term 'overpotential' refer to in electrochemistry?

   1. Excess energy needed for a reaction
   2. Energy released during a reaction
   3. Energy conservation
   4. Entropy change
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   Answer: A. Excess energy needed for a reaction

   Overpotential refers to the additional voltage required to overcome barriers for electron transfer at the electrodes.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following substances acts as a strong electrolyte?
2. In an electrochemical cell, what occurs at the anode?
3. The concept of electrode potentials is based on which principle?
4. What is the effect of increase in temperature on the solubility of most salts?
5. What is the primary purpose of electrolysis?
6. If the concentration of a reactant in an electrochemical cell is increased, what happens to the cell potential according to the Nernst equation?
7. In the electrolysis of water, which gas is evolved at the anode?
8. What does the term 'Faraday's law of electrolysis' relate to?
9. In an electrochemical cell, what happens when the concentration of products increases?
10. What type of reaction occurs at the cathode during electrolysis?
11. Which of the following is not a product of electrolysis?
12. In electrochemical cells, what is the role of a salt bridge?
13. What is the purpose of a standard hydrogen electrode?
14. What does a negative value of Gibbs free energy indicate for a reaction?

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