(B) The bond energy depends on the bond length. As the size of the central atom increases down the group $(N < P < As)$,the bond length increases,and

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(B) The bond energy depends on the bond length. As the size of the central atom increases down the group $(N The order of bond energies is $N-H > P-H > As-H$.The values are $389 \ kJ \ mol^{-1}$ for $N-H$,$318 \ kJ \ mol^{-1}$ for $P-H$,and $247 \ kJ \ mol^{-1}$ for $As-H$.Therefore,the correct order is $389, 318, 247$.

Class 12 Chemistry p-Block Elements (Class 12)Nitrogen family

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The bond energies (in $kJ \ mol^{-1}$) of $N-H$,$P-H$,and $As-H$ are respectively:

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A
$247, 318, 389$
B
$389, 318, 247$
C
$318, 389, 247$
D
$247, 389, 318$

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Nitrogen family

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The bond energies (in $kJ \ mol^{-1}$) of $N-H$,$P-H$,and $As-H$ are respectively:

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