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Nearly all intermediate oxidation states of phosphorus disproportionate into +5 and 3, both in alkali and acid
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Stability of +5 oxidation state decreases down the group in g
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Phosphorus exhibit oxidations states from -3 to +5.The lowest and highest oxidation states are most stable. So, nearly all compounds of phosphorus with intermediate oxidation states disproportionate to compounds with +5 and -3 oxidation states.
Example: