Question

Heavy water is obtained by

• A. Boiling water
• B. Fractional distillation of water
• C. Prolonged electrolysis of water
• D. Heating

Answer 1

The correct option is C Prolonged electrolysis of water

Ordinary water, $H_{2}O$ contains a small proportion of heavy water, $D_{2}O$ (about 1 part in 5000).The main source of heavy water is the ordinary water from which it is isolated. Generally, it is prepared by exhaustive electrolysis.