1.

Statement-1: Heat of solution is positive when Na_(2)SO_(4)*10H_(2)O is dissolved in water bu it is negative when anhydrous CuSO_(4) is dissolved in water. Statement-2: Molar masses of Na_(2)SO_(4)*10H_(2)O and CuSO_(4) are different.

Answer»

Statement-1 is true, statement-2 is true, statement-2 is a CORRECT explanation for statement-1
Statement-1 is true, statement-2 is true, statement-2 is not a correct EXPLNATION for statement-1
Statement-1 is true, statement-2 is FALSE.
Statement-1 is false, statement-2 is true.

Answer :C


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