JEE Main · 2023 · 08 Apr 2023 · Shift 1 · General Principles and Processes of Isolation of Metals

Which of the following metals can be extracted through alkali leaching technique?

(A)Cu
(B)Sn✓ Correct
(C)Pb
(D)Au

Answer: (B)

Solution

Alkali leaching works only when the ore's oxide is amphoteric, because such an oxide dissolves in hot concentrated sodium hydroxide to give a soluble oxoanion, leaving acidic and inert gangue behind. Tin behaves this way:

Sn O_{2}

reacts with alkali to form soluble sodium stannate, taking the metal value into solution. Copper and gold are not recovered by this route — gold is leached with cyanide, not alkali — so among the given metals it is tin that is obtained through alkali leaching.

JEE Main · 2023 · 08 Apr 2023 · Shift 1 · Single correct option

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