In the hydrides of the nitrogen group,the $H-M-H$ bond angle gradually approaches $90^o$ as we move from $N$ to $Sb$. This indicates that gradually.....
- AThe basic character of the hydrides increases.
- BAlmost pure $p$-orbitals are used in $M-H$ bonding.
- CThe bond strength of the $M-H$ bond increases.
- DThe bond pair of electrons moves closer to the central atom.
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$(D)$ reacts with $Na$ metal producing a brown gas
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