1
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
Given below are two statements : One is labelled as Assertion A and the other labelled as reason R

Assertion A : During the boiling of water having temporary hardness, Mg(HCO3)2 is converted to MgCO3.

Reason R : The solubility product of Mg(OH)2 is greater than that of MgCO3.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both A and R are true but R is not the correct explanation of A
B
A is true but R is false
C
Both A and R are true and R is the correct explanation of A
D
A is false but R is true
2
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are :
A
$$-$$SO3H and $$-$$NH2
B
$$-$$NH2 and COOH
C
$$-$$NH2 and $$-$$SO3H
D
$$-$$SO3H and $$-$$COOH
3
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
The INCORRECT statement(s) about heavy water is (are)

(A) used as a moderator in nuclear reactor

(B) obtained as a by-product in fertilizer industry

(C) used for the study of reaction mechanism

(D) has a higher dielectric constant than water

Choose the correct answer from the options given below :
A
(D) only
B
(B) and (D) only
C
(B) only
D
(C) only
4
JEE Main 2021 (Online) 16th March Evening Shift
+4
-1
The correct statements about H2O2 are :

(A) used in the treatment of effluents.

(B) used as both oxidising and reducing agents.

(C) the two hydroxyl groups lie in the same plane.

(D) miscible with water.

Choose the correct answer from the options given below :
A
(A), (C) and (D) only
B
(A), (B), (C) and (D)
C
(A), (B) and (D) only
D
(B), (C) and (D) only
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