STATEMENT -1 : During a chemical reaction, total mass remains constant.
and
STATEMETN -2 : Moles may vary in a reaction.
A. Statement -1 is True, Statement -2 is True, Statement -2 is a correct explanation for Statmenet -1.
B. Statement -1 is True, Statement -2 is True, Statement-2 is NOT a correct explanation for Statement -7
C. Statement -1 is True, Statement -2 is False
D. Statement -1 is False, Statmenet -2 is True