Q 1222134031.    

Assertion : `text()_(1) H^1, text()_(1) H^2` and `text()_(1)H^3` are isotopes of hydrogen.

Reason : Nuclides of the same element of different mass numbers are called isotopes of that element.

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

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