Which of the following process is/are always exothermic?

Enthalpy of combustion and Enthalpy of neutralisation are always exothermic

The heat created when an acid and a base combine to make salt and water is known as the heat (or enthalpy) of neutralisation (H). In the equation above, Q is written as --ΔH and is measured in kJ/mol of water. Since neutralisation reactions are often exothermic, H is a negative number.