A pair in which both species are not likely to exist is:

1.	\(H^+_2,He^{2-}_2\)	2.	\(H^-_2,He^{2+}_2\)
3.	\(H^{2+}_2,He_2\)	4.	\(H^+_2,He^{2+}_2\)

A molecule that has an unequal bond length is : 

Amongst ${\mathrm{H}}_2\mathrm{O},<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{S},<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{Se}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{Te}$ the one with the highest boiling point is:

1. H₂O because of H-bonding.

2. H₂Te because of higher molecular weight.

3. H₂S because of H-bonding.

4. H₂Se because of lower molecular weight.

The correct order of electronegativity of hybrid orbitals of carbon is:

1. sp > sp² < sp³             

2. sp > sp² > sp³

3. sp < sp² > sp³             

4. sp < sp² < sp³

${\mathrm{H}}_2\mathrm{O}$ has a net dipole moment while
\(BeF_2\) has zero dipole moment because :

1. F is more electronegative than oxygen.

2. Be is more electronegative than oxygen. 

3. ${\mathrm{H}}_2\mathrm{O}$ $$ molecule is linear and \(BeF_2\) is bent.

4. ${\mathrm{BeF}}_2$ molecule is linear and ${\mathrm{H}}_2\mathrm{O}$ is bent.

A molecule among the following with non-zero dipole moment is:

1. ${\mathrm{C}}_6{\mathrm{Cl}}_6$

2. ${\mathrm{C}}_2{\mathrm{Cl}}_6$

3. $\mathrm{C}{\left({\mathrm{CCl}}_3\right)}_4$

4. $:{\mathrm{CCl}}_2$

Which molecule is least likely to form hydrogen bonds? 

The correct geometry and hybridization for XeF₄ are : 

1.  Octahedral, sp³d²

2.  Trigonal bipyramidal, sp³d³

3.  Planar triangle, sp³d³

4.  Square planar, sp³d²

Match the compounds given in Column I with the hybridization and shape given in Column II and mark the correct option. 

Which of the following pairs of ions are isoelectronic and isostructural?

1. ${\mathrm{CO}}_3^{2-},<mspace\; width="1em"></mspace>{\mathrm{SO}}_3^{2-}$

2. ${\mathrm{ClO}}_3^{-},<mspace\; width="1em"></mspace>{\mathrm{CO}}_3^{2-}$

3. ${\mathrm{SO}}_3^{2-},<mspace\; width="1em"></mspace>{\mathrm{NO}}_3^{-}$

4. ${\mathrm{ClO}}_3^{-},<mspace\; width="1em"></mspace>{\mathrm{SO}}_3^{2-}$