Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Metals used as semiconductors	(i)	Aluminium
(B)	Electrolytic reduction	(ii)	Zone refining
(C)	Cyanide process	(iii)	Dressing of $ZnS$
(D)	Froth floatation process	(iv)	Extraction of $Ag$

• A. (A) $\to$(i), (B)$\to$(iii), (C)$\to$(ii), (D) $\to$ (iv)
• B. (A) $\to$(iii), (B)$\to$(iv), (C)$\to$(ii), (D) $\to$ (i)
• C. (A) $\to$(iv), (B)$\to$(ii), (C)$\to$(iii), (D) $\to$ (i)
• D. (A) $\to$(ii), (B)$\to$(i), (C)$\to$(iv), (D) $\to$ (iii)

Answer 1

The correct option is D (A) $\to$(ii), (B)$\to$(i), (C)$\to$(iv), (D) $\to$ (iii)

A. Semiconductor materials are purified by zone refining. It works on the solubility difference between metal and impurity.

B. The electrolytic reduction is used for '$Al$' because of high electropositivity.

C. Cyanide Process (or) Mc-Arthur process is used for '$Ag$' extraction.

D. Sulphide ores are concentrated through the froth-flotation method. So, $ZnS$ is purified by it.