Question
Chemistry Question on General Principles and Processes of Isolation of Elements
Germanium of very high purity is obtained by
A
liquation
B
vapor phase refining
C
distillation
D
zone refining
Answer
zone refining
Explanation
Solution
Zone-refining is used to obtain metal of very high purity. The principle on which it is based is that an impure molten metal on gradual cooling will deposit its crystals of pure metal, while the impurities will be left in the remaining part of molten metal. Germanium metal can be purified by this method.