Which one of the following reactions does not occur during… — JEE Main 2023 Chemistry PYQ

JEE Main 2023 · 25 Jan · Shift 1

Which one of the following reactions does not occur during extraction of copper?

A.
$\text{CaO} + \text{SiO}_2 \rightarrow \text{CaSiO}_3$
B.
$2\text{FeS} + 3\text{O}_2 \rightarrow 2\text{FeO} + 2\text{SO}_2$
C.
$2\text{Cu}_2\text{S} + 3\text{O}_2 \rightarrow 2\text{Cu}_2\text{O} + 2\text{SO}_2$
D.
$\text{FeO} + \text{SiO}_2 \rightarrow \text{FeSiO}_3$

Show answer and solution

Correct option: A

Solution

In copper extraction, the ore (copper pyrites, CuFeS₂) is smelted without adding CaO as a flux. The gangue is acidic (SiO₂), so a basic flux would be needed, but in practice FeO itself acts as the basic component and reacts directly with SiO₂ to form the slag FeSiO₃ (option 4). CaO is used as a flux in iron extraction (blast furnace), not in copper extraction — so the reaction CaO + SiO₂ → CaSiO₃ does not occur during copper metallurgy.

[JEE Main 2023 · 25 Jan · Shift 1]

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