Chemistry - Metallurgy Question with Solution | TestHub
During zone refining process a circular heater is passed through a block of impure metal from ' A ' end to ' B ' end then which of the following picture is CORRECT representation of end situation :-
Options:
Answer:
Solution:
Principle: Zone refining relies on the fact that impurities are much more soluble in the molten state than in the solid state of the metal.
Process: As the circular heater moves from end A to end B, the molten zone moves along with it, carrying the dissolved impurities toward end B.
Crystallization: Pure metal particles () continuously crystallize out of the melt at the cooler trailing side, which is end A.
Final State: Consequently, the impurities () accumulate heavily at the finishing end B, leaving purified metal at end A.
Conclusion: Therefore, diagram (D) is the correct representation.
