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1
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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Given below are two statements.

Statement I : During electrolytic refining, blister copper deposits precious metals.

Statement II : In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the correct from the options given below.

A
Both Statement I and Statement II are true.
B
Both Statement I and Statement II are false.
C
Statement I is true but Statement II is false.
D
Statement I is false but Statement II is true.
2
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :

A
$${[Au{(CN)_4}]^ - }$$ and $${[Zn{(CN)_2}{(OH)_2}]^{2 - }}$$
B
$${[Au{(CN)_2}]^ - }$$ and $${[Zn{(OH)_4}]^{2 - }}$$
C
$${[Au{(CN)_2}]^{ - }}$$ and $${[Zn{(CN)_4}]^{2 - }}$$
D
$${[Au{(CN)_4}]^{2 - }}$$ and $${[Zn{(CN)_6}]^{4 - }}$$
3
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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$$-$$
4
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)
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