Zone refining is used for the purification of:

Question

Hoffmann bromamide degradation reaction is shown by which of the following?

Answer 1

Match the purification method to the purity level required by the material.

Zone refining gives extremely high purity, useful only where ordinary purity is not good enough.
Semiconductors like germanium need purity of about one part in $10^9$ because trace impurities change their conductivity behaviour completely, this is exactly what zone refining achieves.
Gold and silver, used in jewellery and industry, are purified using methods such as cupellation, parting, or electrolytic refining, ultra high semiconductor grade purity is not needed for them.
Copper for electrical wiring is purified by electrolytic refining, which is cheaper and gives sufficient purity for conduction, bulk zone refining would be unnecessarily costly.
So the metal purified by zone refining among the choices is germanium, option B.

Answer 2

Match the purification method to the purity level required by the material.

Zone refining gives extremely high purity, useful only where ordinary purity is not good enough.
Semiconductors like germanium need purity of about one part in $10^9$ because trace impurities change their conductivity behaviour completely, this is exactly what zone refining achieves.
Gold and silver, used in jewellery and industry, are purified using methods such as cupellation, parting, or electrolytic refining, ultra high semiconductor grade purity is not needed for them.
Copper for electrical wiring is purified by electrolytic refining, which is cheaper and gives sufficient purity for conduction, bulk zone refining would be unnecessarily costly.
So the metal purified by zone refining among the choices is germanium, option B.

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