Question

In electrolysis the mass deposited on an electrode is directly proportional to

• A. current
• B. square of current
• C. concentration of solution
• D. inverse of current

Answer 1

Answer: (A)

In electrolysis according to first law of Faraday, the mass of a substance deposited at an electrode is directly proportional to the charge passed through the electrolyte ie,
$m\propto q$
If a current $i$ passes for a time $t$, then as we know
$q=it$
Hence, $m\propto it$
or $m\propto i$
Thus, mass deposited at an electrode is directly proportional to current.