Question

Atomic nuclear reactors use heavy water. This is different from ordinary water only to the extent that in place of hydrogen it contains:

• A. deuterium, a heavier isotope of hydrogen
• B. nitrogen, which is also a light element
• C. tritium, an heavier isotope of hydrogen
• D. a radioactive element

Answer 1

The correct option is A deuterium, a heavier isotope of hydrogen

Heavy water $\left(D_{2}O\right)$ is a compound containing deuterium and oxygen. It is used in the atomic nuclear reactor as a moderator. It differs from ordinary water $\left(H_{2}O\right)$ only because it has Deuterium i.e. a heavy isotope of hydrogen.