Match the following metals listed in Column-l with extraction processes listed in Column-ll.

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Solution

a) Silver metal is extracted by amalgamation process:

$A g + H g D i s t i l - -- \to A g ↓ + H g ↑$

b) Calcium is extracted by the electrolysis of fused mixture of $C a C l_{2}$ and $C a F_{2}$

c) When zinc blende is used, the powdered ore is concentrated by froth flotation process. The concentrated ore is heated in excess of oxygen at about $900^{0} C$ . Zinc sulphide is oxidized to zinc oxide.

If some of the ore is oxidized to zinc sulphate, it also decomposes at $900^{0} C$ into $Z n O$ . This is roasting. It is followed by reduction. The reaction that takes place during reduction is the conversion of the oxide into the metal with the help of carbon.

$2 Z n S + 3 O_{2} Δ - \to 2 Z n O + 2 S O_{2} ↑$

$Z n S O_{4} Δ - \to Z n O + S O_{2} + \frac{1}{2} O_{2} ↑$

$Z n O + C Δ - \to Z n + C O ↑$

d) For iron, first, by calcination and roasting, the ferrous oxide is oxidized to ferric oxide. Then, in the blast furnace, smelting is done, where it is reduced to get iron.

$4 F e O + O_{2} \to 2 F e_{2} O_{3}$

$F e_{2} O_{3} + C O \to 2 F e_{3} O_{4} + C O_{2}$

$F e_{2} O_{3} + C O \to F e O + C O_{2}$

$F e O + C O \to F e + C O_{2}$

e) Copper is extracted by self-reduction.

$2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$

$C u_{2} S + 2 C u_{2} O \to 6 C u + S O_{2}$

Suggest Corrections

Column I	Column II
A. Self reduction	P. Lead
B. Carbon reduction	Q. Silver
C. Complex formation and displacement by metal	R. Copper
D. Electrolytic reduction	S. Sodium