The correct order of ionic character among CaH₂, BeH₂, and BaH₂ is:

1. ${\mathrm{BeH}}_2<{\mathrm{CaH}}_2<{\mathrm{BaH}}_2$

2. ${\mathrm{CaH}}_2<{\mathrm{BeH}}_2<{\mathrm{BaH}}_2$

3. ${\mathrm{BeH}}_2<{\mathrm{BaH}}_2<{\mathrm{CaH}}_2$

4. ${\mathrm{BaH}}_2<{\mathrm{BeH}}_2<{\mathrm{CaH}}_2$

Mark the correct order of repulsion among the following according to the VSEPR theory.

In which orbital is the pair of electrons located in the provided carbanion, CH3C≡C^–?

1. sp³
2. sp²
3. sp
4. 2p

In which of the following molecules, all atoms are coplanar?

1.		2.
3.		4.

Which of the following pairs of species have the same bond order?

1. $O_2^{-},N{O}^{+}$

2. $C{N}^{-},CO$

3. $N_2, O_2^{-}$

2. CO, NO

Pair of ions among the following that are isoelectronic and isostructural: 

1.  ${\mathrm{CO}}_3^{2-},$ ${\mathrm{NO}}_3^{-}$

2.  ${\mathrm{ClO}}_3^{-},$ ${\mathrm{CO}}_3^{2-}$

3.  ${\mathrm{SO}}_3^{2-},$ ${\mathrm{NO}}_3^{-}$

4.  ${\mathrm{ClO}}_2^{-},$ ${\mathrm{SO}}_3^{2-}$

The hybridisations of atomic orbitals of nitrogen in NO⁺, NO^-₃ and NH₃ respectively are:

1. $\mathrm{sp},$ ${\mathrm{sp}}^3$ $\mathrm{and}$ ${\mathrm{sp}}^2$

2. ${\mathrm{sp}}^2,$ ${\mathrm{sp}}^3$ $\mathrm{and}$ $\mathrm{sp}$

3. $\mathrm{sp},$ ${\mathrm{sp}}^2$ $\mathrm{and}$ ${\mathrm{sp}}^3$

4. ${\mathrm{sp}}^2,$ $\mathrm{sp}$ $\mathrm{and}$ ${\mathrm{sp}}^3$

Which of the following species has a bond angle of \(120^\circ\)?
1. \({SF}_6\)
2. \(NCl_3\)
3. \(BCl_3\)
4. \(PH_3\)