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Question -

Explain why NH3 isbasic while BiH3 is only feebly basic.



Answer -

NH3 isdistinctly basic while BiH3 is feebly basic.

Nitrogenhas a small size due to which the lone pair of electrons is concentratedin a small region. This means that the charge density per unit volume is high.On moving down a group, the size of the central atom increases and the chargegets distributed over a large area decreasing the electron density. Hence, theelectron donating capacity of group 15 element hydrides decreases on movingdown the group.

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