Question

Heavy water is called so because:

• A. it has dissolved salts in it
• B. it is an oxide of heavy hydrogen
• C. it is a hydride of heavy oxygen
• D. all of the above

Answer 1

The correct option is B it is an oxide of heavy hydrogen

In heavy water, each hydrogen atom is indeed heavier, with a neutron as well as a proton in its nucleus. This isotope of hydrogen is called deuterium, and heavy water's oxide is deuterium oxide, $D_{2}O$.

Hence, option B is correct.