and 
(ii) Physical
state of nitrogen and phosphorus (iii) Shapes of 
and
(iv) Oxidising
power of 
and
(v) Bond angles
of 
and
(vi) Nitrogen
forms larger number of oxides than phosphorus.
Answer:
(a) Halogens react with each
other to form interhalogen compounds. Interhalogen compounds have lower bond dissociation
enthalpy So, they are more reactive than the constituent halogen, e.g. 
A = larger halogen, X =
smaller halogen.
(b) (i) 
is more acidic than HF because HF has
high bond dissociation enthalpy.
(ii) 
is more basic than g because N has
high electron density due to its small size.
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