1.

Assertion: ._(1)H^(1), ._(1)H^(2) and ._(1)H^(3) are isotopes of hydrogen. Reason : Nuclides of the same element of different mass numbers are called isotopes of that element

Answer»

If both assertion and reason are TRUE and the reason is the CORRECT explanation of the assertion
If both assertion and reason are true but reason is not the correct explanantion of the assertion
If assertion is true but reason is false
If assertion is false but reason is true

Answer :A


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