Question

Which of the following statements regarding protium, deuterium and tritium is incorrect?

• A. They are isotopes of hydrogen
• B. They have similar electronic configurations
• C. They exist in the nature in the ratio of $1: 2: 3$
• D. Their atomic masses are in the ratio of $1: 2: 3$

Answer 1

Answer: (D)

Statement (d) is incorrect.
It's correct form is as follows :
The atomic masses of isotopes of hydrogen are not in the ratio of $1: 2: 3$ as abundance of $D$ and $T$ is very less as compared to $H$.
Rest other statements are correct.