1.

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

Answer»

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.
Both A and R are false.

Solution :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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