This chapter is currently out of syllabus
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1
JEE Main 2021 (Online) 24th February Evening 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 : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere.

Reason R : Hydrogen is the lightest element.

In the light of the above statements, choose the correct answer from the options given below :
A
Both A and R are true but R is NOT the correct explanation of A
B
Both A and R are true and R is the correct explanation of A
C
A is true but R is false
D
A is false but R is true.
2
JEE Main 2021 (Online) 24th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
(A) HOCI + H2O2 → H3O+ + Cl- + O2

(B) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2

Choose the correct option.
A
H2O2 acts as reducing and oxidising agent respectively in equations (A) and (B).
B
H2O2 act as oxidizing and reducing agent respectively in equations (A) and (B).
C
H2O2 acts as oxidising agent in equations (A) and (B).
D
H2O2 acts as reducing agent in equations (A) and (B).
3
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Dihydrogen of high purity (> 99.95%) is obtained through :
A
the electrolysis of acidified water using Pt electrodes
B
the electrolysis of warm Ba(OH)2 solution using Ni electrodes
C
the electrolysis of brine solution
D
the reaction of Zn with dilute HCl
4
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The one that is NOT suitable for the removal of permanent hardness of water is :
A
Ion-exchange method
B
Calgon's method
C
Treatment with sodium carbonate
D
Clark's method
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