1
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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 Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following compound CANNOT act as a Lewis base?
A
SF4
B
NF3
C
ClF3
D
PCl5
3
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The solubility of Ca(OH)2 in water is :

[Given : The solubility product of Ca(OH)2 in water = 5.5 $$\times$$ 10$$-$$6]
A
1.11 $$\times$$ 10$$-$$6
B
1.11 $$\times$$ 10$$-$$2
C
1.77 $$\times$$ 10$$-$$6
D
1.77 $$\times$$ 10$$-$$2
4
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The solubility of AgCN in a buffer solution of pH = 3 is x. The value of x is : [Assume : No cyano complex is formed; Ksp(AgCN) = 2.2 $$\times$$ 10$$-$$16 and Ka(HCN) = 6.2 $$\times$$ 10$$-$$10]
A
1.9 $$\times$$ 10$$-$$5
B
1.6 $$\times$$ 10$$-$$6
C
2.2 $$\times$$ 10$$-$$16
D
0.625 $$\times$$ 10$$-$$6
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