In the nitrogen group,as we move from N to Sb | vedclass

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(B) As we move down the group from $N$ to $Sb$,the electronegativity of the central atom $(M)$ decreases.Due to the decrease in electronegativity,the

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Pure $p$-orbitals are used for the $M-H$ bond

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(B) As we move down the group from $N$ to $Sb$,the electronegativity of the central atom $(M)$ decreases.Due to the decrease in electronegativity,the central atom prefers to use its pure $p$-orbitals for bonding with hydrogen atoms,rather than undergoing $sp^3$ hybridization.Since $p$-orbitals are oriented at $90^o$ to each other,the $H-M-H$ bond angle in the hydrides ($NH_3$ to $SbH_3$) decreases and approaches $90^o$.

In the nitrogen group,as we move from $N$ to $Sb$,the $H-M-H$ bond angle in the hydrides approaches $90^o$ because ......

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