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1
JEE Main 2022 (Online) 29th July Morning Shift
MCQ (Single Correct Answer)
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-1
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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.
2
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
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-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
$$\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{Mg} \rightarrow 6 \mathrm{MgO}+4 \mathrm{Al}$$
3
JEE Main 2022 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which of the following methods are not used to refine any metal?

A. Liquation

B. Calcination

C. Electrolysis

D. Leaching

E. Distillation

Choose the correct answer from the options given below:

A
B and D only
B
A, B, D and E only
C
B, D and E only
D
A, C and E only
4
JEE Main 2022 (Online) 26th July Evening Shift
MCQ (Single Correct Answer)
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The metal that is not extracted from its sulfide ore is :

A
Aluminium
B
Iron
C
Lead
D
Zinc
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