Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	One atomic mass unit is defined as one-twelfth of the mass of one carbon-12 atom.
Reason (R):	The carbon-12 isotope is the most abundant isotope of carbon and has been chosen as the standard.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.