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Faraday's first law of electrolysis states that the mass of substance deposited at an electrode is proportional to:
AThe quantity of electricity (Q = I × t) passed
BThe temperature
CThe volume of electrolyte
DThe voltage applied
Answer & Solution
Correct answer: A. The quantity of electricity (Q = I × t) passed
**Faraday's first law**: m ∝ Q = I × t. Same current, longer time → more deposit. Higher current, same time → more deposit. (Voltage drives the current but doesn't directly determine the mass deposited.)
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