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Electrochemistry

Short Answer Type

21. State Kohlrausch’s law of independent migration of ions.

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22. How is molar conductivity related to the degree of dissociation?

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23. How is molar conductivity related to the degree of dissociation?

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24. Given the two half cell reaction:
Anode: Cu(s) → Cu²⁺ (aq) + 2e^–Cathode: Ag⁺ (aq) + e^– → Ag(s)
Write the galvanic cell for the net reaction.

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25. The electrode potentials of four elements A, B, C and D are 1.36 V - 0.32 V, 0.0 V and – 1.26 V respectively. Arrange these elements in the decreasing order of reactivity.

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26. What happens to free energy during operation of a cell?

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27. What is it that ‘Al’ metal cannot be obtained by electrolysis of an aqueous solution of a salt of aluminium?

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28. How many Faradays of electricity are required to liberate 2 moles of hydrogen gas in electrolysis of aq. solution?

Answer:

4H⁺ + 4e^–→ 2H₂(g).
4 Faraday of electricity is required to liberate 2 moles of hydrogen gas.

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29. In operation of a galvanic cell, at one of its electrodes oxidation takes place. What is the name of electrode and what is its polarity?

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30. What is cathodic protection?

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