Question

Zone refining is also known as fractional __

Answer 1

Recall how Zone Refining is performed and try to think why it is also known as Fractional Crystallization. Think about the dimensions of the setup used in Zone refining and compare the length of the metal with how small the melting zone is. Now try and relate the word “crystallization” in this context. On solidification, pure metal solidifies just ahead of the surface of the melt.