Statement 1: Electrolysis of NaCl solution gives chlorine at anode instead of O2.Statement 2: Formation of oxygen at anode requires over voltage.

Electrolysis of NaCl is represented by following chemical reactions At cathode           H+(aq)+e−⟶12H2(g) At anode  Cl−(aq)⟶12Cl2+e−;Ecell∘=1.36V2H2O(aq)⟶O2(g)+4H+(aq)+4e−;Ecell∘=1.23VEcello for this reaction has lower value but formation of oxygen at anode requires over potential.