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Question

In which of the following changes, ΔH0 is always negative?

A
Enthalpy of solution
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B
Enthalpy of hydrogenation
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C
Enthalpy of reaction
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D
Enthalpy of neutralisation
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Solution

The correct options are
B Enthalpy of hydrogenation
D Enthalpy of neutralisation
Enthalpy of hydrogenation and enthalpy of neutralisation is
always exothermic i.e ΔH0<0.
Enthalpy of solution and enthalphy of reaction may be positive or negative.

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