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Question

Mr. Ramu wants to electroplate his key chain with nickel to prevent rusting. For this electroplating:
(i) Name the electrolyte
(ii) Name the cathode
(iii) Name the anode
(iv) Give the reaction at the cathode
(v) Give the reaction at the anode.

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Solution

(i) Electrolyte - Aqueous solution of nickel sulphate

(ii) Cathode - Cleaned key chain to be electroplated

(iii) Anode - Block of nickel metal

(iv) Reaction at cathode: From the electrolyte, the nickel ions gain electrons to form nickel atoms, that get deposited on the article (key chain) as a layer of nickel:

Ni2+ + 2e- Ni(from electrolyte) Nickel deposited on article

(v) Reaction at anode: The nickel anode loses electrons to become nickel ions and goes into the electrolyte.


Ni Ni2+(into electrolyte) + 2e-(from anode) Nickel ions

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