Discussion
The mass of the substance liberated or deposited at any electrode during electrolysis is:
Answer: C
By Faraday's first law of electrolysis, the mass of a substance liberated or deposited at an electrode is directly proportional to the quantity of charge passed, which is the current multiplied by time, so it is directly proportional to the time for which the current is passed.
\[ m = Z\,I\,t \]
The mass is not inversely proportional to the time or to the current, and it is not independent of the time, because a longer current deposits more material. So the third option is correct.
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