NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

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Question : 11
Total: 74
Explain why NH3 is basic while BiH3 is only feebly basic.
Solution:  
The basic character decreases from NH3 to BiH3. The basic natureis due to the presence of lone pair of electrons on the central atom. NH3is 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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