p- Block Elements — Chemistry STD 12 Science — Question
Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryp- Block Elements2 Marks
Question
Explain why $NH _3$ is basic while $BiH _3$ is only feebly basic?
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Answer
$NH _3$ is basic while $BiH _3$ is only feebly basic because the intensity of charge on $NH _3$ due to its small size is very high, the large electron density on central atom can easily donate its lone pair of electron and acts as Lewis base. In case of $BiH _3$ due to larger size the electron density around central atom is less. So, it behaves as mild base because it does not donate its lone pair easily.
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