Protium, Deuterium and Tritium — Prelims Questions

Which of the following statements about Protium, Deuterium, and Tritium is INCORRECT?

Which isotope of hydrogen is used as a moderator in nuclear reactors?

What is the number of neutrons in a single atom of Tritium ($^3_1\text{H}$)?

Which of the following properties is expected to be significantly different between $H_2O$ and $D_2O$?

Tritium undergoes beta decay. What is the product nucleus formed after one beta decay event?

Which of the following statements best describes the 'isotope effect' observed in reactions involving hydrogen isotopes?