In nitrogen family the H–M–H bond angle in the hydrides MH3 gradually becomes closer to 90oC on going from N to Sb. This shows that gradually :

From ammonia to SbH3 bond angle approaches a value of 90°. This indicates in NH3 - orbitals involved in hybridisation while in going down the group pure p-orbitals are participating in bonding.

In nitrogen family the H–M–H bond angle in the hydrides MH3 gradually becomes closer to 90oC on going from N to Sb. This shows that gradually :

From ammonia to SbH3 bond angle approaches a value of 90°. This indicates in NH3 - orbitals involved in hybridisation while in going down the group pure p-orbitals are participating in bonding.

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In nitrogen family the H–M–H bond angle in the hydrides MH₃ gradually becomes closer to 90^oC on going from N to Sb. This shows that gradually :

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Almost pure p-orbitals are used for M–H bonding

This basic strength of the hydrides increases

The bond pairs of electrons become further apart form the central atom

The bond energies of M–H bond increase

answer is B, D.

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Detailed Solution

From ammonia to SbH₃ bond angle approaches a value of 90°. This indicates in NH₃ - orbitals involved in hybridisation while in going down the group pure p-orbitals are participating in bonding.

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