Assertion(A) : Heat of vaporisation is always endothermic.
Reason(R ) : Water is exithermic compound.

Assertion(A) : Heat of neutralisation is always less than zero. Reason(R ) : Neutralisation involves reactions between an acid and a base.

Latent heat of vaporisation of water,

Assertion (A): The dissolution of gases in water is always an endothermic process. Reason (R ) : The dissolution of gases in water proceed with a negative value of DeltaS .

Assertion (A): The dissolution of gases in water is always an endothermic process. Reason (R ) : The dissolution of gases in water proceed with a negative value of DeltaS .

Assertion (A): The dissolution of gases in water is always an endothermic process. Reason (R ) : The dissolution of gases in water proceed with a negative value of DeltaS .

Assertion (A) : All the decomposition reactions are endothermic. Reason (R) : Decomposition reactions require energy in the form of heat, light of electricity.

Assertion (A): Hypolimnetic layer of water is always cold. Reason(R): The water holds the temperature of soil at the bottom of pond.