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One mole of anhydrous salt AB dissolves ...

One mole of anhydrous salt AB dissolves in water and liberates `15 J mol^(-1)` of heat .The value of `Delta H_(hydration)^°` of `AB` is `-20.05 J` `mol^(-1)` .Hence the enthalpy of dissolution of hydrated salt `AB.3H_2O(s)` is

A

`-5.5J` `mol^(-1)`

B

`5.5J` `mol^(-1)`

C

`35.5J` `mol^(-1)`

D

`-35.5J` `mol^(-1)`

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The correct Answer is:
B
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