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Answer: The net cell reaction is Cu(s) + 2Ag + (aq) → Cu 2+ (aq) + 2Ag(s) and the galvanic cell is Cu(s) |Cu 2 + (aq) || Ag + (aq) | Ag(s)

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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.

Answer:

The net cell reaction is
Cu(s) + 2Ag⁺ (aq) → Cu²⁺ (aq) + 2Ag(s)
and the galvanic cell is
Cu(s) |Cu²+ (aq) || Ag⁺ (aq) | Ag(s)

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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?

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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?