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A mixture of potassium chlorate , oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number

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answer is C.

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Detailed Solution

$\begin{array}{r} K \overset{+ 5}{Cl} O_{3} + H_{2} {\overset{+ 3}{C}}_{2} O_{4} + H_{2} \overset{+ 6}{S} O_{4} ⟶ K_{2} \overset{+ 6}{S} O_{4} + K \overset{- 1}{Cl} + \overset{+ 4}{C} O_{2} + H_{2} O \end{array}$

Maximum change in oxidation number is observed in $Cl (+ 5$ to $- 1)$

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