JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 4 August 2021, Shift 2, Chemistry Q33

Question 33 of 90 in this shift, Chemistry question 3 of 30, Section A.

During the isolation of copper from copper matte,

\mathrm{SiO_2}

is added to

(1)remove FeS / FeO as $\mathrm{FeSiO_3}$ .Official answer
(2)reduce the melting point of the matte.
(3)reduce $\mathrm{Cu_2S}$ to metallic Cu.
(4)remove any C present.

Official answer

Option 1

NTA final key.

Chapter: General Principles and Processes of Isolation of Elements
Topic: Metallurgical Extraction
Idea tested: Silica Flux in Copper Smelting

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.