JEE Main 2022 (Online) 29th July Morning Shift | Isolation of Elements Question 17 | Chemistry

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JEE Main 2022 (Online) 29th July Morning Shift

MCQ (Single Correct Answer)

-1

In metallurgy the term "gangue" is used for :

Contamination of undesired earthy materials.

Contamination of metals, other than desired metal.

Minerals which are naturally occurring in pure form

Magnetic impurities in an ore.

JEE Main 2022 (Online) 28th July Morning Shift

MCQ (Single Correct Answer)

-1

Which of the reaction is suitable for concentrating ore by leaching process ?

$$ 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} $$

$$\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO} \rightarrow 3 \mathrm{FeO}+\mathrm{CO}_{2}$$

$$\mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]$$

$$\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{Mg} \rightarrow 6 \mathrm{MgO}+4 \mathrm{Al}$$

JEE Main 2022 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

-1

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) - (IV), (B) - (III), (C) - (I), (D) - (II)

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

(A) - (III), (B) - (IV), (C) - (II), (D) - (I)

(A) - (III), (B) - (IV), (C) - (I), (D) - (II)

JEE Main 2022 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

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:

B and D only

A, B, D and E only

B, D and E only

A, C and E only

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