1
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

A
Zinc
B
Gold
C
Silver
D
Copper
2
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

A
HOCl + H2O2 $$\to$$ H3O+ + Cl$$-$$ + O2
B
PbS + 4H2O2 $$\to$$ PbSO4 + 4H2O
C
2MnO$$_4^ - $$ + 3H2O2 $$\to$$ 2MnO2 + 3O2 + 2H2O + 2OH$$-$$
D
Mn2+ + H2O2 $$\to$$ Mn4+ + 2OH$$-$$
3
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List-I with List-II

List-I
(Metal)
List-II
(Emitted light wavelength (nm))
(A) Li (I) 670.8
(B) Na (II) 589.2
(C) Rb (III) 780.0
(D) Cs (IV) 455.5

Choose the most appropriate answer from the options given below :

A
(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
B
(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
C
(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
D
(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
4
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List-I with List-II.

List-I
(Metal)
List-II
(Application)
(A) Cs (I) High temperature thermometer
(B) Ga (II) Water repellent sprays
(C) B (III) Photoelectric cells
(D) Si (IV) Bullet proof vest

Choose the most appropriate answer from the options given below :

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