In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

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 abundant isotope of carbon and has been Chosen as standard.

(i) Both A and R are true, and R is the Correct explanation Of A.

(ii) Both A and R are true, but R is not the correct explanation of A

(iii) A is true but R is false.

(iv) Both A and R are false.

Answers (1)

The answer is the option (ii) Both A and R are true, but R is not the correct explanation of A.

Explanation: Carbon has isotopes and Carbon-12 is one of the isotopes is  represented as 12C.

12C has a mass of exactly 12 amu –(atomic mass units) and mass of all other elements are calculated with respect to this. One amu is the mass exactly of one twelfth the mass of one 12C atom.

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