Extraction of Metals - Result Question 4
####4. Match the refining methods Column I with metals Column II.
\begin{aligned} & \hline | Column I |
| :— |
| (Refining Methods) |
& \hline I. Liquation
& \hline II. Zone refining
& \hline III. Mond process
& \hline IV. van Arkel method
& \hline\end{aligned}
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Solution:
- Refining of crude metals results pure metals and its impurities get separated out.
I. Liquation In this method low melting metals like $Sn, Pb, Bi$ and $Hg$ can be made to flow down through a sloping surface leaving behind the higher melting impurities on the hearth.
II. Zone refining The basic principle of the method is, impurities are more soluble in the molten metal than in the solid state of the metal. This method is useful to produce semiconductors and ultra-pure metals like $B, Ga, In, Si$ and Ge.
Mond process
IV. van Arkel method
Here, $M=Zr, Hf, Ti$
Hence, the correct matching is
$$ I \rightarrow(C), II \rightarrow(D), III \rightarrow(B), IV \rightarrow(A) $$
