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Valency and Oxidation State

Solve the hal...

Question

Solve the half reaction given in column I w.r.t. information for reactant in column II

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Solution

$I^{-} \to I O {_{4}}^{-}$ /oxidation/ change in oxidation state (O.S.) is 8
$S^{2 -} \to S O_{4}^{2 -}$ /oxidation/ change in O.S. is 8.
$A l_{2} O_{3} \to A l$ /reduction/ change in O.S. is 3.
$H_{3} P O_{2} \to P H_{3}$ /reductuion/ change in O.S. is 4.

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