The element of Group VA that exhibits maximum number of oxidation states in its compounds

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The element of Group VA that exhibits maximum number of oxidation states in its compounds

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arsenic

nitrogen

bismuth

phosphorus

answer is D.

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Detailed Solution

Common oxidation state of group 5 elements are −3,+3 and +5.
Nitrogen shows -3 to +3 oxidation state. All oxidation state from +1 to +4 disproportionate in acid solution in case of nitrogen.
Phosphorous shows +1 and +4 oxidation states in some oxoacids. All intermediate oxidation state disproportionate in acid and alkali into −3 and +5.
However, +3 oxidation state for Ar, Sb, Bi become increasingly stable with respect to disproportionation.