Question

On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be ______.

Options

• Hydrogen gas

• Oxygen gas

• Hydrogen sulphide (H₂S) gas

• Sulphur dioxide (SO₂) gas

Answer 1

On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be oxygen gas.

Explanation:

Dissociation of sulfuric acid,

\[\ce{H2SO4 -> 2H^+_{ (aq)} + SO^{-2}_{4{ (aq)}}}\]

Dissociation of water,

\[\ce{H2O -> H{^{+}_{(aq)}} + OH^-_{ (aq)}}\]

At Anode: \[\ce{4OH- -> 2H2O_{(l)} + O2_{(g)} + 4e-}\]

At Cathode: \[\ce{2H^+_{ (aq)} + 2e- -> H2_{(g)}}\]