Question

Choose the correct option regarding the following assertion and reason.

Assertion: Heavy water is about 10% heavier than normal water.
Reason: Deuterium does not have any neutron.

• A. Assertion is correct but reason is wrong
• B. Assertion is wrong but the reason is correct
• C. Both assertion and reason are correct but reason is not the correct explanation for the assertion
• D. Both assertion and reason are correct and the reason is the correct explanation for the assertion

Answer 1

The correct option is A Assertion is correct but reason is wrong

Deuterium reacts with oxygen to form deuterium oxide, which is known as heavy water (${\text{D}}_2\text{O}$).
Deuterium is an isotope of hydrogen having one proton, one electron and a neutron.
Due to this extra neutron in deuterium, heavy water is about 10% heavier than normal water (${\text{H}}_2\text{O}$).