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Assertion(A) One atomic mass unit is def...

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

A

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

B

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

C

A is true but R is false.

D

Both A and R are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct explanation. Choosing C-12 as the standard, the relative masses of atoms come out to be close to whole number values and ambiguity of oxygen as reference was solved.
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