Question

Which isotope of hydrogen is used in making heavy water?

• A. Protium
• B. Deuterium
• C. Tritium
• D. Both B and C

Answer 1

The correct option is B

Deuterium

The explanation for the correct option: Option B

• Deuterium is the isotope of Hydrogen which is used to make heavy water.
• Heavy Water is deuterium oxide $\left({\mathrm{D}}_2\mathrm{O}\right)$ and is made up of two atoms of deuterium and one atom of oxygen.
• Deuterium has double the mass of hydrogen due to the presence of an extra neutron in its nucleus.

Therefore, Option B is correct.