Question

During electrorefining of copper, the number of electrons involved in the reactions are

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

During electrorefining of copper, the reactions involved are-

At cathode (loss of two electrons):
$C{u}^{+2}+2e\to Cu$
At anode (gain of two electrons):
$2{\mathrm{Cl}}^{-}\to {\mathrm{Cl}}_2+2e^{-}$
Hence, two electrons are involved in oxidation and reduction