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.
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What is the standard electrode potential of a hydrogen electrode?
- 0 V
- -1.07 V
- 1.23 V
- 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.
What is the Nernst equation used for in electrochemistry?
- To calculate reaction rates
- To determine cell potential under non-standard conditions
- To find molarity
- 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.
What happens to the charge of anions at the anode during electrolysis?
- They gain electrons
- They lose electrons
- They remain unchanged
- 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.
What is the main product of the electrolysis of molten sodium chloride?
- Sodium hydroxide
- Sodium metal
- Chlorine gas
- 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.
What does the term 'overpotential' refer to in electrochemistry?
- Excess energy needed for a reaction
- Energy released during a reaction
- Energy conservation
- 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.