is an exothermic compound but 
is an endothermic compound.
(ii) Nitrogen
does not form pent chloride like phosphorus.
Answer:
(i) Nitrogen has three unpaired
electron in the valence shell with which it can from three bonds - nitrogen
forms 
with the help of one 
bond and two re-bonds.
Size of
phosphorous is large. It cannot forms Ti-bond, phosphorus completes its valency
by forming three 
bond with three other
phosphorous atom. This is why nitrogen forms but
phosphorus forms 
.
(ii) Bond
energy of 
is greater than the bond energy of 
. Therefore, formation of 
is energetically favourable. Thus, is known but 
is
not known.
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