The process of zone refining is most suitable for purifying metals with:
Low melting points and high thermal conductivity
Low melting points and low thermal conductivity
High melting points and high thermal conductivity
High melting points and low thermal conductivity
The process of zone refining is most suitable for purifying metals with high melting points and low thermal conductivity, as this allows for precise control of the purification zone.
Hence option 4 is correct.