The decreasing order of ionic character of the N-H, F-H, C-H, and O-H, is :  

1.	N-H > F-H > C-H > O-H
2.	F-H > N-H > C-H > O-H
3.	O-H > C-H > F-H > N-H
4.	F-H > O-H > N-H > C-H

The right order of increase in the ionic character of the molecules,
 LiF, K₂O, N₂, SO₂, ClF₃ is :

1. N₂ < SO₂ < ClF₃ < K₂O < LiF

2. N₂ > SO₂ > ClF₃ > K₂O < LiF

3. N₂ > SO₂ > K₂O > ClF₃ > LiF

4. LiF > K₂O < ClF₃ > SO₂ > N₂

The number of (i) sp² hybridized carbon atoms and (ii) $\mathrm{\pi }$ bonds are present in the following compound are:

1. 7, 5

2. 8, 6

3. 7, 6

4. 8, 5

From the perspective of molecular orbital theory, which statement is false?

1. ${\mathrm{Be}}_2$ is not a stable molecule.

2. ${\mathrm{He}}_2$ is not stable but ${\mathrm{He}}_2^{+}$ is expected to exist.

3. Bond strength of ${\mathrm{N}}_2$ is maximum amongst the homonuclear diatomic molecules belonging to the second period.

4. The order of energies of molecular orbitals in ${\mathrm{N}}_2$ molecule is: 

${\mathrm{\sigma }}_{2\mathrm{s}}<{\mathrm{\sigma }}_{2\mathrm{s}}^{*}<{\mathrm{\sigma }}_{2{\mathrm{p}}_{\mathrm{z}}}<({\mathrm{\pi }}_{2{\mathrm{p}}_{\mathrm{x}}}\approx {\mathrm{\pi }}_{2{\mathrm{p}}_{\mathrm{y}}})$
$<({\mathrm{\pi }}_{2{\mathrm{p}}_{\mathrm{x}}}^{*}\approx {\mathrm{\pi }}_{2{\mathrm{p}}_{\mathrm{y}}}^{*})<{\mathrm{\sigma }}_{2{\mathrm{p}}_{\mathrm{z}}}^{*}$

Combination of atoms A and B that forms an anti-bonding molecular orbital is :

1. $\frac{{\mathrm{\Psi }}_{\mathrm{A}}^2}{{\mathrm{\Psi }}_{\mathrm{B}}^2}$

2. ${\mathrm{\Psi }}_{\mathrm{A}}^2\times {\mathrm{\Psi }}_{\mathrm{B}}^2$

3. ${\mathrm{\Psi }}_{\mathrm{A}}+{\mathrm{\Psi }}_{\mathrm{B}}$

4. ${\mathrm{\Psi }}_{\mathrm{A}}-{\mathrm{\Psi }}_{\mathrm{B}}$

In $P{O}_4^{-3}$, formal charge on every oxygen atom and P-O bond order respectively are:
1.  -0.75 and 1.25
2.  -0.5 and 2
3.  1 and 1.5
4.  -0.75 and 2

In a regular octahedral molecule, MX₆, the number of X–M–X bonds at 180º is:

In NO₃^– ion, the number of bond pair and lone pair of electrons on nitrogen atom are respectively:

The incorrect statements among the following are-

A pair in which both species are not likely to exist is: