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1
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-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
2
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
3
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.
4
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which of the reaction is suitable for concentrating ore by leaching process ?

A
$$ 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} $$
B
$$\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO} \rightarrow 3 \mathrm{FeO}+\mathrm{CO}_{2}$$
C
$$\mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]$$
D
$$\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{Mg} \rightarrow 6 \mathrm{MgO}+4 \mathrm{Al}$$
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