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(C) Zone refining is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. As the heater moves,the

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Very pure semiconductors

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(C) Zone refining is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. As the heater moves,the pure metal crystallizes out of the melt and the impurities pass into the adjacent molten zone. This method is particularly useful for producing semiconductors like $Si, Ge, Ga, B,$ and $In$ in a very high state of purity.

List-$I$	List-$II$
$A$. Van Arkel method	$P$. Purification of titanium
$B$. Solvay process	$Q$. Manufacture of $Na_2CO_3$
$C$. Bessemerisation	$R$. Reduction of copper
$D$. Hall-$H$éroult process	$S$. Extraction of aluminium

The zone refining method is used to obtain.......

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The zone refining method is mainly used for..........

Match the List-$I$ and List-$II$.

List-$I$ List-$II$

$A$. Van Arkel method $P$. Purification of titanium

$B$. Solvay process $Q$. Manufacture of $Na_2CO_3$

$C$. Bessemerisation $R$. Reduction of copper

$D$. Hall-$H$éroult process $S$. Extraction of aluminium

$TiI_{4}$ on heating gives

Electric refining is used for refining of

Explain the purification of metals in the vapour phase with an example.

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