Ncert Exercises & Solutions

Match Column I with Column II for the oxidation states of the central atoms.

Codes:

Hint: The oxidation state of Mn in

{MnO}_{4}^{-}

is +7.

A. Oxidation number of Cr in

{Cr}_{2} O_{7}^{2 -}

2 x + 7 (- 2) = - 2

2 x - 14 = - 2

2 x = + 12

x = + 6

B. Oxidation number of Mn in

{MnO}_{4}^{-}

x + 4 (- 2) = - 1

x - 8 = - 1

x = + 7

C. Oxidation number of V in

{VO}_{3}^{-}

x + 3 (- 2) = - 1

x - 6 = - 1

x = + 5

D. Oxidation number of Fe in

{FeF}_{6}^{3 -}

x + 6 (- 1) = - 3

x - 6 = - 3

x = + 3