JEE Main 2021 (Online) 25th July Evening Shift | Isolation of Elements Question 51 | Chemistry

JEE Main 2021 (Online) 25th July Evening Shift

MCQ (Single Correct Answer)

-1

Match List I with List II : (Both having metallurgical terms)

	List - I		List - II
(a)	Concentration of Ag ore	(i)	Reverberatory furnace
(b)	Blast furnace	(ii)	Pig iron
(c)	Blister copper	(iii)	Leaching with dilute NaCN solution
(d)	Froth floatation method	(iv)	Sulfide ores

Choose the correct answer from the options given below :

(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

-1

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

TiO₂

Fe₂O₃

ZnO

SiO₂

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-1

Sulphide ion is soft base and its ores are common for metals.

(a) Pb (b) Al (c) Ag (d) Mg

(a) and (c) only

(a) and (d) only

(a) and (b) only

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

Consider two chemical reactions (A) and (B) that take place during metallurgical process:

(A) $$ZnC{O_{3(s)}}\buildrel \Delta \over \longrightarrow Zn{O_{(s)}} + C{O_{2(g)}}$$

(B) $$2Zn{S_{(s)}} + 3{O_{2(g)}}\buildrel \Delta \over \longrightarrow 2Zn{O_{(s)}} + 2S{O_{2(g)}}$$

The correct option of names given to them respectively is :

(A) is calcination and (B) is roasting

Both (A) and (B) are producing same product so both are roasting

Both (A) and (B) are producing same product so both are calcination

(A) is roasting and (B) is calcination

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