Electrochemistry Quiz - CBSE Class 11 Science
Free practice quiz: Electrochemistry (CBSE Class 11 Science). 20 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 standard hydrogen electrode (SHE)?
- 0.00 V
- 1.00 V
- -1.00 V
- 2.00 V
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Answer: A. 0.00 V
By definition, the standard electrode potential of SHE is 0.00 V.
In an electrolytic cell, what is the role of the anode?
- Reduction occurs
- Oxidation occurs
- Both oxidation and reduction occur
- Neither oxidation nor reduction occurs
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Answer: B. Oxidation occurs
Oxidation (loss of electrons) takes place at the anode in an electrolytic cell.
Explain the concept of overpotential.
- The potential required to initiate a reaction
- The extra potential needed to overcome activation energy
- The potential difference between two electrodes
- The potential at equilibrium
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Answer: B. The extra potential needed to overcome activation energy
Overpotential is the additional voltage required beyond the theoretical value to drive an electrochemical reaction at a significant rate.
What is the role of a salt bridge in a galvanic cell?
- To increase the conductivity
- To maintain electrical neutrality
- To provide a path for electrons
- To prevent the build-up of charge
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Answer: B. To maintain electrical neutrality
The salt bridge allows the flow of ions to maintain electrical neutrality in the half-cells, preventing charge build-up and ensuring continued electron flow.
What are the factors affecting the rate of corrosion?
- Nature of the metal
- Presence of impurities
- Environmental conditions
- All of the above
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Answer: D. All of the above
Corrosion rate is influenced by the metal's nature, impurities, and environmental factors like humidity, temperature, and the presence of electrolytes.