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Nitrogen has a reasonable oxidation number in all of the following compound and yet one of them is not stable.which one and why?1)NF3 2)NF5 3)HNO3 4)NO



NF5 is the answer. 
Nitrogen has a maximum covalence of 4. It cannot extend its configuration beyond 4 due to the absence of d orbitals in N atom. Hence it cannot form NF5.
2 4 2
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