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1
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which one of the following reactions does not occur during extraction of copper?

A
$$\mathrm{2FeS + 3{O_2} \to 2FeO + 2S{O_2}}$$
B
$$\mathrm{FeO + Si{O_2} \to FeSi{O_3}}$$
C
$$\mathrm{CaO + Si{O_2} \to CaSi{O_3}}$$
D
$$\mathrm{2C{u_2}s + 3{O_2} \to 2C{u_2}O + 2S{O_2}}$$
2
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
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-1
Out of Syllabus
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The metal which is extracted by oxidation and subsequent reduction from its ore is :

A
Al
B
Cu
C
Ag
D
Fe
3
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Match List I with List II

List-I
 List-II
A. Reverberatory furnace I. Pig Iron
B. Electrolytic cell II. Aluminium
C. Blast furnace III. Silicon
D. Zone Refining furnace IV. Copper

Choose the correct answer from the options given below :

A
A-III, B-IV, C-I, D-II
B
A-IV, B-II, C-I, D-III
C
A-I, B-IV, C-II, D-III
D
A-I, B-III, C-II, D-IV
4
JEE Main 2022 (Online) 29th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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In metallurgy the term "gangue" is used for :

A
Contamination of undesired earthy materials.
B
Contamination of metals, other than desired metal.
C
Minerals which are naturally occurring in pure form
D
Magnetic impurities in an ore.
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