(i) What is the covalency of N in N2O5 ? (ii) Explain why phosphorus forms pentachloride whereas nitrogen and bismuth do not ?

Unless oxygen is combined with fluorine or isolated from other atoms, the oxidation number of oxygen atoms is always taken as -2. This gives a total oxidation number charge of...

(a) Kc=[PCl3] [Cl2] / [PCl5] (b) 120.48  (c) (i) equilibrium will shift on RHS.  (ii) equilibrium will shift on LHS.  (iii) equilibrium will shift on RHS.

(b) calcium and phosphorus

[Hint : Due to strong electronegativity, small size of nitrogen atom and presence of lone pair of electrons on N atom.]

[Hint : Because it have polymeric structure consisting chains of P4 tetrahedra, hence denser than white P while red P is not having angular strain as in white P, hence...

Nitrogen owing to its small size has a tendency to form pπ−pπ multiple bonds with itself. Nitrogen thus forms a very stable diatomic molecule, N2. On moving down a group,...

(c) Nitrogen form N2 (i.e. N = N) but phosphorus form P4 , because in P2 , pπ — pπ bonding is present which is a weaker bonding

 (b) Inert pair effect

 Maximum covalency of nitrogen is (c) 4 

 (b) White phosphorus exists as P4 tetrahedral molecule having P-P-P bond angle 60º. Hence the molecule is under strain and more reactive. On the other hand red phosphorus exists as...