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Which of the following is not the characteristic of impurities in electroplating?

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Which of the following is not the characteristic of impurities in electroplating?

(a) Are formed near cathode

(b) Are mostly noble metals

(c) Are formed near anode

(d) Increase the strength of solution

This question was addressed to me during an internship interview.

This intriguing question originated from Characteristics of Electroplating Wastes in portion Electroplating of Engineering Chemistry II

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The correct answer is (a) Are formed near cathode

The best explanation: During electroplating, the impurities are mostly noble metals (especially in the case of alkali and alkaline earth metals). That is why due to higher density at anode, the impurities are formed near anode.

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