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(B) According to Faraday's first law of electrolysis,the mass $(m)$ of a substance deposited or liberated at an electrode is directly proportional to

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Equivalent weight

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(B) According to Faraday's first law of electrolysis,the mass $(m)$ of a substance deposited or liberated at an electrode is directly proportional to the quantity of electricity $(Q)$ passed through the electrolyte: $m \propto Q$. Since $Q = I 	imes t$,we have $m = Z 	imes I 	imes t$,where $Z$ is the electrochemical equivalent. The electrochemical equivalent $(Z)$ is defined as the mass deposited by $1 	ext{ Coulomb}$ of charge,and it is related to the equivalent weight $(E)$ by the formula $Z = \frac{E}{F}$,where $F$ is Faraday's constant. Therefore,the mass deposited is directly proportional to the equivalent weight of the substance.

The mass deposited at an electrode during electrolysis is directly proportional to which of the following?

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