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Which of the following is the strongest ...

Which of the following is the strongest base ?

A

`AsH_3`

B

`NH_3`

C

`PH_3`

D

`SbH_3`

Text Solution

Verified by Experts

The correct Answer is:
B
In the hydrides of group `15`, the basic character decreases down the group. `NH_3` is the strongest electron pair donar due to its small size as the electron density of the electron pair is concentrated over a small region. As the size increases, the electron density gets diffused over a large region and hence the ability to donate th electron pair decreases. Therefore, the basic nature decreases.
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