BITSAT 2024Paper 2

Exam: BITSAT
Year: 2024
Paper: Paper 2
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

BITSAT 2024 · Paper 2 · Chemistry · General Principles and Processes of Isolation of Metals

The chemical composition of 'slag' formed during the smelting...

The chemical composition of 'slag' formed during the smelting process in the extraction of copper is

Options

A $\mathrm{Cu}_2 \mathrm{O}+\mathrm{FeS}$
B $\mathrm{FeSiO}_3$
C $\mathrm{CuFeS}_2$
D $\mathrm{Cu}_2 \mathrm{ S}+\mathrm{FeO}$

Correct answer

B. $\mathrm{FeSiO}_3$

Step-by-step solution

During the extraction of copper, iron is present in the ore as impurity (FeS). The ore together with a little coke and silica is smelted; FeS present as impurity in the ore is oxidized to iron oxide, which then reacts with silica to form fusible ferrous silicate which is removed as slag.

2 \mathrm{FeS}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{FeO}+2 \mathrm{SO}_2 \uparrow

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