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1
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Heavy water is used for the study of reaction mechanism.

Reason (R) : The rate of reaction for the cleavage of O - H bond is slower than that of O - D bond.

Choose the most appropriate answer from the options given below :
A
Both (A) and (R) are true but (R) is not the true explanation of (A).
B
Both (A) and (R) are true and (R) is the true explanation of (A).
C
(A) is false but (R) is true.
D
(A) is true but (R) is false.
2
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
A
CuCl2
B
AgCl
C
ZnCl2
D
Cu2Cl2
3
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following methods is most suitable for preparing deionized water?
A
Synthetic resin method
B
Clark's method
C
Calgon's method
D
Permutit method
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :
A
1 and 1
B
3 and 1
C
2 and 1
D
2 and 2
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