Match the following according to conversion by heat:

Column-$I$	Column-$II$
$(a)$ Required heat to convert solid into gaseous.	$(i)$ Latent heat of fusion
$(b)$ Required heat to convert solid into liquid.	$(ii)$ Latent heat of vaporization

(A) The latent heat of fusion is the heat required to change a substance from a solid state to a liquid state at its melting point.
The latent heat of vaporization is the heat required to change a substance from a liquid state to a gaseous state at its boiling point.
However,the direct conversion from solid to gas is called sublimation. In the context of standard latent heat definitions provided in the options:
$(a)$ Required heat to convert solid into gaseous is associated with the process of vaporization (often involving sublimation energy,but here matched to the provided options).
$(b)$ Required heat to convert solid into liquid is defined as the Latent heat of fusion.
Therefore,the correct matching is $(a-ii), (b-i)$.