Physics - Current Electricity Question with Solution | TestHub

If $m$ is the mass of a substance deposited or liberated at an electrode during electrolysis when a charge $q$ passes through electrolyte, then according to Faraday's first law of electrolysis, or $\begin{array}{rl}& m\propto q\\ & m=zq\end{array}$ where $z$ is a constant of proportionality and is called electrochemical equivalent (ECE) of the the substance. If an electric current $I$ flows through the electrolyte, then $\therefore$ $\begin{array}{rl}q& =It\\ m& =zit\end{array}$ Here, $\begin{array}{rl}i=1.5\mathrm{A},t& =10\min =10\times 60\mathrm{s},\\ z& =30\times 10^{-5}{\mathrm{gC}}^{-1}\end{array}$ Hence, mass of copper deposited on the electrode $\begin{array}{rl}m& =30\times 10^{-5}\times 1.5\times 10\times 60\\ & =27\times 10^{-2}=0.27\mathrm{g}\end{array}$