Identify the wrong statement among the following: 

1. Amongst isoelectronic species, the smaller the positive charge on the cation, the smaller the ionic radius.
2. Amongst isoelectronic species, the greater the negative charge on the anion, the larger is the ionic radius.
3. The atomic radius of the elements increases as one moves down the first group of the Periodic Table.
4. The atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the Periodic Table.

The set of isomers of ${\mathrm{C}}_6{\mathrm{H}}_4{\mathrm{Cl}}_2$ that have an equal dipole moment with ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}$ & C₆H₆ respectively is : 

Xe F${}_2$ is isostructural with : 

1. ${\mathrm{SbCl}}_3$

2. ${\mathrm{BCl}}_3$

3. ${\mathrm{TeF}}_2$

4. ${\mathrm{ICl}}_2^{-}$

Non-Zero dipole moment is shown by : 

1. ${\mathrm{CO}}_2$

2. p-Dichlorobenzene

3. Carbontetrachloride

4. Water.

An incorrect statement regarding resonating structures is : 

Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is:

The hybridization of orbitals of N atom in $N{O}_3^{-}, N{O}_2^{+, }and N{H}_4^{+}$ are respectively:

1. $sp, s{p}^2, s{p}^3$

2. $s{p}^2, sp, s{p}^3$

3. $sp, s{p}^3, s{p}^2$

4. $s{p}^2, s{p}^3, sp$

Which of the following compounds is a planar and a polar compound?
 
1. TeCl₄
2. SO₂
3. SF₆
4. XeF₂

A molecule having the smallest bond angle among the following is :

Molecule/Ion that is diamagnetic in nature is: