Answer:
(i) Due to stable half filled p3
configuration in nitrogen its first ionisation enthalpy is higher than oxygen
(p4).
(ii) Sulphur
vapour exists as molecule. It exhibits some
paramagnetic behaviour because its anti bonding molecular orbital contains two
unpaired electrons.
(iii)
Ionisation enthalpy of only Xe is lower and suitable or compound formation.
(iv) N - N bond
is weaker than the single P - P bond because of high interelectronic repulsion
of the non bonding electrons owing to the small bond length. As a result catenation
tendency is weaker in nitrogen.
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