Which of the following species contains three bond pairs and one lone pair around the central atom?

1. $H_{2}O$

2. $B{F}_3$

3. $N{H^{-}}_2$

4. $PC{l}_3$

The pair of species with the same bond order is:

1. $O_2^{2-},$ $B_2$

2. $O_2^{+},\mathrm{ N}{O}^{+}$

3. NO, CO

4. $N_2,O_2$

Which of the two ions from the list given below have the geometry that is explained by the same hybridisation of orbitals, ${\mathrm{NO}}_2^{-},{\mathrm{NO}}_3^{-},{\mathrm{NH}}_2^{-},{\mathrm{NH}}_4^{-},{\mathrm{SCN}}^{-}$ ?

1.  ${\mathrm{NH}}_4^{-}$ $\mathrm{and}$ ${\mathrm{NO}}_3^{-}$

2.  ${\mathrm{SCN}}_{}^{-}$ $\mathrm{and}$ ${\mathrm{NH}}_2^{-}$

3.  ${\mathrm{NO}}_2^{-}$ $\mathrm{and}$ ${\mathrm{NH}}_2^{-}$

4.  ${\mathrm{NO}}_2^{-}$ $\mathrm{and}$ ${\mathrm{NO}}_3^{-}$

Which of the following has the minimum bond length?

1.  ${\mathrm{O}}_2^{-}$

2.  ${\mathrm{O}}_2^{2-}$

3.  ${\mathrm{O}}_2$

4.  ${\mathrm{O}}_2^{+}$

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has a high melting point?

1. Metallic bonding

2. Van der Waals' bonding

3. Ionic bonding

4. Covalent bonding

In which of the following pairs of molecules/ions, the central atoms have sp² hybridization?

1. $N{O}_2^{-}$ $and$ $N{H}_3$

2. $B{F}_3$ $and$ $N{O}_2^{-}$

3. $N{H}_2^{-}and$ $H_{2}O$

4. $B{F}_3$ $and$ $N{H}_2^{-}$

A molecule/ion among the following species that does not exist under normal conditions is:

1. \(Be^+_2\)
2. \(Be_2\)
3. \(B_2\)
4. \(Li_2\)

The correct order of increasing bond angles in the following species is:

1. \(C l_{2} O < C l O_{2} < C l O_{2}^{-}\)

2. \(C l O_{2} < C l_{2} O < C l O_{2}^{-}\)

3. \(C l_{2} O < C l O_{2}^{-} < C l O_{2}\)

4. \(C l O_{2}^{-} < C l_{2} O < C l O_{2}\)

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three?

1. ${\mathrm{SF}}_4$

2. ${\mathrm{I}}_3^{-}$

3. ${\mathrm{SbCl}}_5^{2-}$

4. ${\mathrm{PCl}}_5$

According to the MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order?

1. $N_2^{-}<N_2<N_2^{2-}$

2. $N_2^{2-}<N_2^{-}<N_2$

3. $N_2<N_2^{2-}<N_2^{-}$

4. $N_2^{-}<N_2^{2-}<N_2$