There is no hybridisation of the central atom in ${AsH}_{3}$ because:

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as is of 3rd period element

the energy gap between 3s and 3p orbital is large enough

the energy gap between 4s and 4p orbital is large enough

the energy gap between 3s and 3p orbital is sufficiently less

answer is D.

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Detailed Solution

There is no hybridization of the central atom in AsH3 because the energy difference between the 4s and 4p orbitals in ${AsH}_{3}$ is sufficient, the centre atom does not undergo hybridization.

Hence correct option is D.

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