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1
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Statements about heavy water are given below :

A. Heavy water is used in exchange reactions for the study of reaction mechanisms.

B. Heavy water is prepared by exhaustive electrolysis of water.

(C) Heavy water has higher boiling point than ordinary water.

(D) Viscosity of H2O is greater than D2O.

Choose the most appropriate answer from the options given below :
A
A, B, and C only
B
A and C only
C
A and D only
D
A and B only
2
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Water does not produce CO on reacting with :
A
C
B
CH4
C
C3H8
D
CO2
3
JEE Main 2021 (Online) 24th February Morning Slot
MCQ (Single Correct Answer)
+4
-1
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).
4
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
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
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