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Q.

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

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a

∆solutionH

b

∆hydrationH

c

∆subH

d

∆cH

answer is C.

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Detailed Solution

1- Formation of solution can be exothermic or endothermic

2- Combustion is always exothermic

3- Sublimation is always endothermic

4- Hydration of ions is always exothermic

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