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

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

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.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

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.

Watch 3-min video & get full concept clarity