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

1.	\(O^{2-}_2\)	2.	\(O_2\)
3.	\(O^{-}_2\)	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.  \(\frac{3}{2}\)

Which of the following compounds has the least tendency to form hydrogen bonds between molecules?

1.  ${\mathrm{NH}}_3$

2.  ${\mathrm{H}}_2\mathrm{NOH}$

3.  HF

4.  ${\mathrm{CH}}_3\mathrm{F}$

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 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.  ${\mathrm{SbH}}_3$

The correct order of stability for the following species is:

From the given structures, the correct structure(s) of ${\mathrm{PF}}_3{\mathrm{Cl}}_2$ is are

l.  

ll.  

lll.  

1.  Only l

2.  Only ll

3.  Only lll

4.  l, ll and lll