1
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
$$\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{Mg} \rightarrow 6 \mathrm{MgO}+4 \mathrm{Al}$$
2
JEE Main 2022 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II.

List - I
(Mixture)
List - II
(Purification Process)
(A) Chloroform & Aniline (I) Steam distillation
(B) Benzoic acid & Napthalene (II) Sublimation
(C) Water & Aniline (III) Distillation
(D) Napthalene & Sodium chloride (IV) Crystallisation

Choose the correct answer from the options given below :

A
(A) - (IV), (B) - (III), (C) - (I), (D) - (II)
B
(A) - (III), (B) - (I), (C) - (IV), (D) - (II)
C
(A) - (III), (B) - (IV), (C) - (II), (D) - (I)
D
(A) - (III), (B) - (IV), (C) - (I), (D) - (II)
3
JEE Main 2022 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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)
+4
-1
Change Language

The metal that is not extracted from its sulfide ore is

A
Aluminium
B
Iron
C
Lead
D
Zinc
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