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 correct relationship for the bond angle of water and dimethyl ether $\left({\mathrm{CH}}_3-\underset{..}{\overset{..}{\mathrm{O}}}-{\mathrm{CH}}_3\right)$ is: 

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 > ClF₃ > K₂O > LiF

4. LiF > K₂O < ClF₃ > SO₂ > N₂

Match the compounds of Xe in column I with the molecular structure in column II.

   Column-I       Column-II

(a) ${\mathrm{XeF}}_2$       (i) Square planar

(b) ${\mathrm{XeF}}_4$     (ii) Linear

(c) ${\mathrm{XeO}}_3$      (iii) Square pyramidal

(d) ${\mathrm{XeOF}}_4$    (iv) Pyramidal

(1) (a)-(ii) (b)-(i) (c)-(iii) (d)-(iv)

(2) (a)-(ii) (b)-(iv) (c)-(iii) (d)-(i)

(3) (a)-(ii) (b)-(iii) (c)-(i) (d)-(iv)

(4) (a)-(ii) (b)-(i) (c)-(iv) (d)-(iii)

Among the following, the maximum covalent character is shown by which compound:

1. ${\mathrm{MgCl}}_2$

2.$$ ${\mathrm{FeCl}}_2$

3. ${\mathrm{AlCl}}_3$

4. ${\mathrm{SnCl}}_2$

Which one of the following pair of species have the same bond order?

(1) CN${}^{-}$ and NO${}^{+}$

(2) CN and CN${}^{+}$

(3) O${}_2^{ -}$ and CN${}^{-}$ 

(4) NO${}^{+}$ and CN${}^{+}$

The correct increasing order of the polarizing power of the cationic species  ${\mathrm{K}}^{+}, {\mathrm{Ca}}^{2+}, {\mathrm{Mg}}^{2+}, {\mathrm{Be}}^{2+}$is: 

1. ${\mathrm{Be}}^{2+}<{\mathrm{K}}^{+}<{\mathrm{Ca}}^{2+}<{\mathrm{Mg}}^{2+}$

2. ${\mathrm{K}}^{+}<{\mathrm{Ca}}^{2+}<{\mathrm{Mg}}^{2+}<{\mathrm{Be}}^{2+}$

3. ${\mathrm{Ca}}^{2+}<{\mathrm{Mg}}^{2+}<{\mathrm{Be}}^{2+}<{\mathrm{K}}^{+}$

4. ${\mathrm{Mg}}^{2+}<{\mathrm{Be}}^{2+}<{\mathrm{K}}^{+}<{\mathrm{Ca}}^{2+}$

Which of the following species exhibits the diamagnetic behaviour?

(1) O${}_2^{ +}$

(2) O${}_2$

(3) NO

(4) O${}_2^{ 2-}$

A molecule or ion that has an unequal bond length is: