JEE Main · 2021 · 16 Mar 2021 · Shift 1 · General Principles and Processes of Isolation of Metals

The process that involves the removal of sulphur from the ores is:

(A)Smelting
(B)Leaching
(C)Refining
(D)Roasting✓ Correct

Answer: (D)

Solution

A sulphide ore is heated in a steady current of air at a temperature below its melting point. The sulphur is burnt off as

S O_{2}

and the metal is left as its oxide, ready for reduction:

2 ZnS + 3 O_{2} \to 2 ZnO + 2 S O_{2}

Smelting reduces an oxide with coke, leaching dissolves the ore selectively in a reagent, and refining purifies the crude metal already obtained, so none of these expels sulphur from the ore. The process that removes sulphur from the ores is roasting.

JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Single correct option

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