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Q.

Which of the following enthalpy is always positive ?

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a

Enthalpy of formation

b

Enthalpy of solution
 

c

Enthalpy of  phase transition

d

None of these

answer is D.

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Detailed Solution

Enthalpy is always positive for an endothermic reaction. It is not positive for the given options.

Thus, option 4 is correct.

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