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The stability of +5 oxidation state decr...

The stability of `+5` oxidation state decreases down the group `15` of the periodic table.Explain this observation giving appropriate reasons.

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In group 15 elements (Nitrogen family ), as we move down the group, the `+3` oxidation states of the elements become more and more stable due to the inert pair effect . As a result, valence s-electrons become less available for bond formation and valence p-electrons participate.
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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Questions From Board Examinations
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  18. Why phosphorus is more reactive than nitrogen?

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  20. Arrange the following in order of decreasing N - O bond length NO(2)^(...

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