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1
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al2O3 with cryolite.

Reason (R) : The oxidation state of Al in cryolite is +3.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
(A) is true but (R) is false.
B
(A) is false but (R) is true.
C
Both (A) and (R) are correct and (R) is the correct explanation of (A)
D
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements :

Statement I : The process of producing syn-gas is called gasification of coal.

Statement II : The composition of syn-gas is CO + CO2 + H2 (1 : 1 : 1)

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is false but Statement II is true
B
Statement I is true but Statement II is false
C
Both Statement I and Statement II are false
D
Both Statement I and Statement II are true
3
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List-I with List-II :

List - I
(Name of ore/mineral)		 List - II
(Chemical formula)
(a) Calmine (i) $$Zns$$
(b) Malachite (ii) $$FeC{O_3}$$
(c) Siderite (iii) $$ZnC{O_3}$$
(d) Sphalerite (iv) $$CuC{O_3}.Cu{(OH)_2}$$


Choose the most appropriate answer from the options given below :
A
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
B
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
D
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which refining process is generally used in the purification of low melting metals?
A
Chromatographic method
B
Liquation
C
Electrolysis
D
Zone refining
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