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Q.

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

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a

phosphorus 

b

arsenic 

c

bismuth 

d

nitrogen
 

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.
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