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Q.

In the oxidation of potassium iodide to iodine using ozone in alkaline medium, the number of hydroxyl ions participating in the net reaction are

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a

1

b

2

c

3

d

4

answer is B.

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Detailed Solution

Balancing by ion-electron method (alkaline medium)

\underline {Reduction{\text{ }}half{\text{ }}reaction} \underline {\,\,Oxidation\,half\,reaction}
{O_3} \to {O_2}\,\,\, 2{I^ - } \to {I_2} + 2{e^ - } \to (2)
\\ {O_3} \to {O_2}\, + {H_2}O \\\ {O_3} + 2{H_2}O \to {O_2}\, + {H_2}O + 2O{H^ - } \\ {O_3} + {H_2}O \to {O_2}\, + 2O{H^ - } \\ {O_3} + {H_2}O + 2{e^ - } \to {O_2}\, + 2O{H^ - } \to (1) \\  

Net   reaction is

O_3+2I^-+H_2O\rightarrow I_2+O_2+2OH^-                                

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