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Question

Hydrogen peroxide oxidises [Fe(CN)6]4- to [Fe(CN)6]3- in acidic medium but reduces [Fe(CN)6]3- to [Fe(CN)6]4- in alkaline edium. The other products formed are, respectively :

Options

A.

(H2O + O2) and (H2O + OH-)

B.

H2O and (H2O + O2)

C.

H2O and (H2O + OH-)

D.

(H2O + O2) and H2O

Solution

(i) [Fe+2 (CN)6]4- + H2O2-1 + 2H+
                    ↓
[Fe+3 (CN)6]3- + 2H2O-2
                    ↓
(ii)  [Fe+3 (CN)6]3- + H2O2-1 + 2OH-
                    ↓
[Fe+2 (CN)6]4- + O20 + 2H2O

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