JEE Main · 2023 · 24 Jan 2023 · Shift 2 · General Principles and Processes of Isolation of Metals

The metal which is extracted by oxidation and subsequent reduction from its ore is :

(A)Al
(B)Ag✓ Correct
(C)Cu
(D)Fe

Answer: (B)

Solution

Silver is won from its ore by first bringing the metal into solution and then recovering it, a sequence of oxidation followed by reduction. Treating the ore with dilute sodium cyanide in the presence of air oxidises silver into the soluble complex

[Ag (CN)_{2}]^{-}

, and adding zinc then reduces that complex back to free silver. This oxidation-then-reduction route picks out silver.

JEE Main · 2023 · 24 Jan 2023 · Shift 2 · Single correct option

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