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(a) Write the reaction of the thermal d...

(a) Write the reaction of the thermal decomposition of sodium azide.
(b) Why does `NH_3` act as a Lewis base ?

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(a) Thermal decomposition of sodium azide, `NaN_3` gives `N_2` gas.
(b)
Lone pair on `N` in `NH_3` is present in one of the `sp^3` hybridised orbital, due to the directional nature of lone-pair of elelctron on which is available for donation, `NH_3` acts as a Lewis base.
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