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

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Question : 12
Total: 74
Nitrogen exists as diatomic molecule and phosphorus as P4. Why?
Solution:  
Nitrogen is diatomic gaseous molecule at ordinary temperaturedue to its ability to form pπ pπ multiple bonds. The molecule has oneσ and two π-bonds. Phosphorus exists as discrete tetratomic tetrahedralmolecules as these are not capable of forming multiple bonds due torepulsion between non-bonded electrons of the inner core.
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