The species in which the central atom uses $s{p}^2$ hybrid orbitals is

1.  ${\mathrm{PH}}_3$

2.  ${\mathrm{NH}}_3$

3.  ${{\mathrm{CH}}_3}^{+}$

4.  ${\mathrm{SbH}}_3$

Which of the following contain a maximum number of electrons in the antibonding molecular orbitals?

1.  ${O_2}^{2-}$

2.  $O_2$

3.  ${O_2}^{1-}$

4.  ${O_2}^{+}$

The bond order for a species with the configuration $\sigma 1s^2 \sigma *1s^2 \sigma 2s^2 \sigma *2s^2 \sigma {{\rho }^1}_x$ will be

1.  1

2.  $\frac{1}{2}$

3.  Zero

4.  3/2

Which molecule is least likely to form hydrogen bonds? 

Which of the following compounds has zero dipole moment?

1.  ${\mathrm{NH}}_3$

2.  ${\mathrm{NF}}_3$

3.  ${\mathrm{BF}}_3$

4.  ${\mathrm{CHCl}}_3$

The bond order of ${\mathrm{NO}}^{+}$ ion is

1.  1

2.  2

3.  2.5

4.  3

The linear molecule among the following is

1.  ${\mathrm{CO}}_2$

2.  ${\mathrm{NO}}_2$

3.  ${\mathrm{SO}}_2$

4.  ${\mathrm{ClO}}_2$

The molecule having the highest dipole moment is

1.  ${\mathrm{CO}}_2$

2.  ${\mathrm{CH}}_4$

3.  ${\mathrm{NH}}_3$

4.  ${\mathrm{NF}}_3$

The species which has triangular planar geometry is

1.  ${\mathrm{NF}}_3$

2.  ${{\mathrm{NO}}_3}^{-}$

3.  ${{\mathrm{BF}}_4}^{-}$

4.  ${\mathrm{SbH}}_3$

Identify the correct sequence of stability for the molecular species:

1.  ${\mathrm{Li}}_2 < {{\mathrm{He}}_2}^{+} < {{\mathrm{O}}_2}^{+} < {\mathrm{C}}_2$

2.  ${\mathrm{C}}_2 < {{\mathrm{O}}_2}^{+} < {\mathrm{Li}}_2 < {{\mathrm{He}}_2}^{+}$

3.  ${{\mathrm{He}}_2}^{+}< {\mathrm{Li}}_2< {\mathrm{C}}_2 < {{\mathrm{O}}_2}^{+}$

4.  ${{\mathrm{O}}_2}^{+} < {\mathrm{C}}_2 < {\mathrm{Li}}_2 < {{\mathrm{He}}_2}^{+}$