Assertion (A) : 1 gm each of hydrogen and deuterium contains the same number of atoms
Reason (R) : Hydrogen and deuterium are isobars

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Both A and R are true, and R is the correct explanation of A.

Both A and R are true, but R is not the correct explanation of A.

A is true, but R is false.

A and R are false

answer is D.

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Detailed Solution

Actually, 1 gram of hydrogen and 1 gram of deuterium do not contain the same number of atoms. This is because hydrogen and deuterium have different atomic masses. Hydrogen has an atomic mass of approximately 1 amu, while deuterium, which is an isotope of hydrogen, has an atomic mass of approximately 2 amu. Therefore, for a given mass, deuterium will have half the number of atoms as hydrogen.And Hydrogen and deuterium are isobars.

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