Question

Difference between congruent and incongruent melting point

Answer 1

Congurent melting  it is actually the melting of solid in such a way that the composition of the resultant liquid remain the same as was in the melted solid.
Congurent melting point shows the definite temperature  of a compound.

Incongurent melting  is not a uniformly melting of compounds , instead of this solid substance changes in to the liquid or solid such that the composition do not remain the same .  
hope this will help you.

Answer 2

The thermal behavior of intermediate compounds is classified into congruent and incongruent melting types.

In Congruent melting, the compounds or the basic components of the binary system are known to melt congruently or in harmony. The composition of the liquid that is formed after melting is the same as that of the solid.

 

In incongruent melting, one of the intermediate compounds in the solid phase transforms into another solid phase compound and a liquid phase, which are both having different chemical compositions than the original composition.