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1
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which of the following chemical reactions represents Hall-Heroult Process?

A
Cr2O3 + 2Al $$\to$$ Al2O3 + 2Cr
B
2Al2O3 + 3C $$\to$$ 4Al + 3CO2
C
FeO + CO $$\to$$ Fe + CO2
D
2[Au(CN)2]$$_{(aq)}^ - $$ + Zn(s) $$\to$$ 2Au(s) + [Zn(CN4)]2$$-$$
2
JEE Main 2022 (Online) 24th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List - I with List - II :

List - I List -II
(A) Sphalerite (I) FeCO$$_3$$
(B) Calamine (II) PbS
(C) Galena (III) ZnCO$$_3$$
(D) Siderite (IV) ZnS

Choose the most appropriate answer from the options given below :

A
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
B
(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
C
(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
D
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
3
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Calamine and Malachite, respectively, are the ores of :
A
Nickel and Aluminium
B
Zinc and Copper
C
Copper and Iron
D
Aluminium and Zinc
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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)
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