The number of antibonding electrons pairs in ${O_2}^{2-}$ on the basis of MO theory are:

(1) 4

(2) 3

(3) 2

(4) 5

If ${\mathrm{CdI}}_2$ is pink in colour, the ${\mathrm{CdCl}}_2$ will be '.............' coloured.

(1) yellow         

(2) red                 

(3) blue                   

(4) cannot be predicted

Which are true statements among the following?

(1) $P{H}_5$ and $BiC{l}_5$ does not exist 

(2) $p\pi$-$d\pi$ bonds are present in $S{O}_2$ 

(3) Electrons travel with speed of light 

(4) $Se{F}_4$ and $C{H}_4$ has same charge on central atom

(5) ${I_3}^{+}$ has bent geometry 

(a) 1,3 

(b) 1,2,5 

(c) 1,3,5

(d) 1,2,4 

In which molecule all atoms are coplanar?

1. $C{H}_4$

2. $B{F}_3$

3. $P{F}_3$

4. $N{H}_3$

Among the following which is paramagnetic?

1. $\text{Cl}_2 \text{O}_6$
2. $\text{Cl}_2 \text{O}_7$
3. $\text{Cl}_2 \text{O}$
4. $\text{ClO}_2$

The correct statement among the following for a compound having a higher dipole moment is-

$N{F}_3$ is:

(1) non-polar compound 

(2) electrovalent compound 

(3) having low value of dipole moment than $N{H}_3$

(4) having more dipole moment than $N{H}_3$

Polarization of electrons in acrolein may be written as: 

1. $\stackrel{{\delta }^{-}}{C}{H}_2=CH-\stackrel{{\delta }^{+}}{C}H=O$

2. $\stackrel{{\delta }^{-}}{C}{H}_2=CH-CH=\stackrel{{\delta }^{+}}{O}$

3. $\stackrel{{\delta }^{-}}{C}{H}_2=\stackrel{{\delta }^{+}}{C}H-CH=O$

4. $\stackrel{{\delta }^{+}}{C}{H}_2=CH-CH=\stackrel{{\delta }^{-}}{O}$

$PC{l}_5$ exists but $NC{l}_5$ does not because:

1. Nitrogen has no vacant d-subshells .

2. $NC{l}_5$ is unstable .

3. Nitrogen atom is much smaller than p .

4. Nitrogen is highly inert .