IMAT 2016 Q52 [Oxidation States]

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Five of the ions of vanadium are listed below:

  1. VO_3^–
  2. V^{3+}
  3. V^{2+}
  4. VO^{2+}
  5. VO_2^+

Which two ions have vanadium in the same oxidation state?

A. 2 and 5
B. 1 and 5
C. 3 and 4
D. 4 and 5
E. 1 and 3

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oxidation number of o = -2
oxidation number of elements in ion state = charge of ion
oxidation number of multi atomic ion = charge 0f ion
so :

  1. VO3- : x + 3 (-2) = -1 , x -6=-1 , x=+5
  2. V3+ : +3
  3. V2+ : +2
  4. VO2+ : x + (-2)=+2 , x = 2+2 = +4
  5. VO2 + : x + 2 (-2) = +1 , x-4=1 , x= +5

1 and 5 have the same oxidation state, which is option B

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