Long Answer TypeDiscuss the orbital shapes of the following covalent molecules:
(i) HF (ii) H2O (iii) NH3.
Short Answer TypeWhy are lone pair-lone pair repulsion stronger than lone pair-bond pair.
The lone pairs are localised on the central atom, while each bonded pair is shared between two atoms. consequently, the lone pair electrons in molecules occupy more space as compared to the bonding pair electrons. This causes greater repulsion between lone pairs of electrons as compared to the lone pair -bond pair and bond pair-bond pair repulsion.
Long Answer TypeUsing the orbital overlap concept, explain the formation of:
(i) O2 molecule (ii) N2 molecule.
What is coordinate or dative bond? Explain the formation of the bond with some examples.
Short Answer TypeLong Answer Type
Switch
bond and a 
bond.
