Give reasons for the following :
(a) Red phosphorus is less reactive than white phosphorus.
(b) Electron gain enthalpies of halogens are largely negative.
(c) N2O5 is more acidic than N2O3.

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) Red phosphorus is less reactive than white phosphorus because White phosphorus is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. Red phosphorus is a polymer of P4 tetrahedra, which has much less angular strain. This high angular strain makes white phosphorus unstable and highly reactive

(b) Electron gain ethalpies of halogens an largely negative because of their small size in their respective period, they have high effective nuclear charge, \therefore They readily accept one electron to acquire noble gas configuration
(c) N2O5 is more acidic than N2O3 as N in N2O5 is in +5 oxidation and N in  N2O3 is in +3 oxidation number, more is the acidity.

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