NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions
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Question : 11
Total: 74
Explain why N H 3 is basic while B i H 3 is only feebly basic.
Solution:
The basic character decreases from N H 3 to B i H 3 . The basic natureis due to the presence of lone pair of electrons on the central atom. N H 3 is the strongest electron pair donor due to its small size as the electrondensity of the electron pair is concentrated over a small region. As the sizeincreases the electron density gets diffused over a large region and hencethe ability to donate the electron pair (basic nature) decreases.
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