Question

In which of the following changes, $\Delta H^0$ is always negative?

• A. Enthalpy of solution
• B. Enthalpy of hydrogenation
• C. Enthalpy of reaction
• D. Enthalpy of neutralisation

Answer 1

Answer: (B), (D)

The correct options are
B Enthalpy of hydrogenation
D Enthalpy of neutralisation

Enthalpy of hydrogenation and enthalpy of neutralisation is
always exothermic i.e $\Delta H^0<0$.
Enthalpy of solution and enthalphy of reaction may be positive or negative.