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Question
Which of the following is not refined by zone refining method?
Which of the following is not refined by zone refining method?
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Solution
The correct option is D Gold
Zone refining is based on the principle that the impurities are more soluble in the molten state than in the solid state of the metal.
A circular mobile heater is fixed at one end of a rod of the impure metal.The molten zone moves along with the heater which is moved forward.
As heater moves, pure metal crystallise out of melt and impurity pass on to adjacent molten zone. Process is repeated several times and the heater is moved in same direction. Impurities get concentrated at one end which is cut-off
Semiconductors such as germanium, silicon and gallium are refined by zone refining.
Gold is generally refined via electrolysis.
Zone refining is based on the principle that the impurities are more soluble in the molten state than in the solid state of the metal.
A circular mobile heater is fixed at one end of a rod of the impure metal.The molten zone moves along with the heater which is moved forward.
As heater moves, pure metal crystallise out of melt and impurity pass on to adjacent molten zone. Process is repeated several times and the heater is moved in same direction. Impurities get concentrated at one end which is cut-off
Semiconductors such as germanium, silicon and gallium are refined by zone refining.
Gold is generally refined via electrolysis.
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