Which of the following is always negative?

The amount of heat that is emitted or absorbed during the dissolving process is known as the enthalpy change of solution (at constant pressure). There are two possible values for this enthalpy of solution (H solution): positive (endothermic) and negative (exothermic).

Enthalpy of hydrogenation and enthalpy of neutralization is
always exothermic i.e., ${\mathrm{\Delta H}}^0<0$.

Enthalpy of solution and enthalpy of reaction may be positive or negative.