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Electrochemistry

Short Answer Type

11. Suggest a list of metals that are extracted electrolytically.

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12. Consider the reaction: Cr₂O₇^2– + 14H⁺ + 6e- → 2Cr³⁺ + 8H₂O
What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr₂O₇^2-?

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13.

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

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14. Suggest two materials other than hydrogen that can be used as fuels in fuel cells.

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Long Answer Type

15. Explain how rusting of iron is envisaged as setting up of an electrochemical cell.

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Short Answer Type

16. What is thermodynamic efficiency of a cell?

Answer:

The fuel cell thermodynamic efficiency is given by the ratio of the Gibbs function change to the Enthalpy change in the overall cell reaction. The Gibbs function change measures the electrical work and the enthalpy change is a measure of the heating value of the fuel.
Efficiency = (dG/dH)

Thermodynamic efficiency,