1
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation.

Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both A and R are true and R is the correct explanation of A
B
A is true but R is false
C
A is false but R is true
D
Both A and R are true but R is NOT the correct explanation of A
2
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
Which among the following species has unequal bond lengths?
A
XeF4
B
BF$$_4^ -$$
C
SiF4
D
SF4
3
JEE Main 2021 (Online) 25th February Morning Slot
+4
-1
According to molecular orbital theory, the species among the following that does not exist is :
A
$${O_2}^{2 - }$$
B
$$B{e_2}$$
C
$$H{e_2}^ -$$
D
$$H{e_2}^ +$$
4
JEE Main 2021 (Online) 24th February Evening Slot
+4
-1
The correct set from the following in which both pairs are in correct order of melting point is :
A
LiCl > LiF ; NaCl > MgO
B
LiCl > LiF ; MgO > NaCl
C
LiF > LiCl ; NaCl > MgO
D
LiF > LiCl ; MgO > NaCl
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