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Which one of the following enthalpy change will have positive sign only

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a
∆solutionH
b
∆cH
c
∆subH
d
∆hydrationH

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detailed solution

Correct option is C

1- Formation of solution can be exothermic or endothermic2- Combustion is always exothermic3- Sublimation is always endothermic4- Hydration of ions is always exothermic

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Heat of solution of  BaCl2.2H2O=200 kJ mol-1

Heat of hydration of  BaCl2 =-150 kJ mol-1

Hence heat of solution of BaCl2  is


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