Question

Heavy water is obtained by:

• A. boiling water
• B. fractional distillation of water
• C. prolonged electrolysis of $H_{2}O$ containing alkali
• D. heating $H_2{O}_2$

Answer 1

The correct option is C prolonged electrolysis of $H_{2}O$ containing alkali

Heavy water is deuterium oxide $\left(D_{2}O\right)$ which is prepared by the prolonged electrolysis of ordinary water containing alkali.