Question

ASSERTION:- Protium, deuterium and tritium are isotopes of hydrogen. REASON:- Isotopes of an element have same mass numbers.​

Answer 1

The answer is:-
Assertion is true but reason is false or
A is true but r is false.
Explanation:-
Protium,deuterium and tritium are isotopes of hydrogen. But isotopes are atoms of the same element with same atomic number but different mass numbers but here it is given that isotopes have same mass numbers so it is false. Therefore, the answer is assertion is true but reason is false.