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(C) In $NCl_3$ and $N(CH_3)_3$,the nitrogen atom is bonded to three atoms and has one lone pair,resulting in $sp^3$ hybridisation and a pyramidal geom

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$N(SiH_3)_3$

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(C) In $NCl_3$ and $N(CH_3)_3$,the nitrogen atom is bonded to three atoms and has one lone pair,resulting in $sp^3$ hybridisation and a pyramidal geometry.In $N(SiH_3)_3$,the lone pair on the nitrogen atom is donated into the vacant $d$-orbital of the silicon atom due to $p\pi-d\pi$ back-bonding.This back-bonding changes the geometry of the nitrogen atom from pyramidal to planar,making the nitrogen atom $sp^2$ hybridised.

Which molecule is $sp^2$ hybridised?

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