Class 12 Chemistry
Chapter 3 – Electrochemistry
Magical Series Assignment 9
Q.1. What type of battery is mercury cell? Why is it more advantageous than dry cell?
Q.2. What type of a battery is the lead storage battery? Write the anode and the cathode reactions and the overall reaction occurring in a lead storage battery when current is drawn from it.
Q.3. Write the reactions taking place at cathode and anode in lead storage battery when the battery is in use. What happens on charging the battery?
Q.4. Mention the reactions occurring at (i) anode, (ii) cathode, during working of a mercury cell. Why does the voltage of a mercury cell remain constant during its operation?
Q.5. What is a nickel–cadmium cell? State its one merit and one demerit over lead storage cell. Write the overall reaction that occurs during discharging of this cell.
Q.6. Define Fuel cell.
Q.7. Name the type of cell which was used in Apollo space programme for providing electrical power.
Q.8. Write two advantages of H2–O2 fuel cell over ordinary cell.
Q.9. Explain the electrode reactions involved in the working of a fuel cell. [Hint: H2–O2 fuel cell].
Q.10. What is corrosion?
Q.11. The chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactions occurring during the corrosion of iron in the atmosphere.
Q.12. Using the Eo values of A and B predict which is better
for coating the surface of iron
[ EoFe2+/Fe
= –0.44 V ] to prevent corrosion and why?
EoA2+/A
= –2.37 V; EoB2+/B
= 0.14 V.
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