(a) Draw the structures of the following :
(b) Explain the following observations :
(i) The electron gain enthalpy of sulphur atom has a greater negative value than that of oxygen atom.
(ii) Nitrogen does not form pentahalides.
(iii) In aqueous solutions HI is a stronger acid than HCl.
Shape : Square pyramidal
(b) (i) Because enthalpy of dissociation of S-S bond is higher than O-O bond and the hydration energy of is less than that of ion.
(ii) Due to absence of empty d-orbitals, does not form pentahalides.
(iii) Due to lower bond dissociation energy and higher degree of ionization, HI acts as stronger acid than HCl in aqueous solution.