Question

On electrolysis of dilute copper sulphate solution using platinum electrodes, the products obtained at cathode and anode respectively are:

• A. H₂ and O₂
• B. Cu and O₂
• C. H₂ and SO₂
• D. O₂ and H₂

Answer 1

The correct option is B Cu and O₂

Reduction potential of Cu²⁺ is higher than H⁺ hence Cu²⁺ will be reduced at cathode more easily.

Reaction at cathode:

$C{u}^{2+}\left(aq\right)+2e^{-}\to Cu\left(s\right)$

Reaction at anode:

$2H_{2}O\left(l\right)\to O_2\left(g\right)+4H^{+}\left(aq\right)+4e^{-}$