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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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The correct answer is:
$\mathrm{Cl}$
When a mixture of potassium chlorate, oxalic acid and sulphuric acid is heated, the following reaction occurs :
\(\stackrel{+5}{\mathrm{KClO}_3}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+\stackrel{+6}{\mathrm{H}_2 \mathrm{S} \mathrm{O}_4} \rightarrow \stackrel{+6}{\mathrm{K}_2 \mathrm{S} \mathrm{O}_4}+\stackrel{-1}{\mathrm{KCl}}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}\)
i.e. maximum change in oxidation number is observed in \(\mathrm{Cl}(+5\) to-1).
Thus, $\mathrm{Cl}$ is the element which undergoes maximum change in the oxidation state.
\(\stackrel{+5}{\mathrm{KClO}_3}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+\stackrel{+6}{\mathrm{H}_2 \mathrm{S} \mathrm{O}_4} \rightarrow \stackrel{+6}{\mathrm{K}_2 \mathrm{S} \mathrm{O}_4}+\stackrel{-1}{\mathrm{KCl}}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}\)
i.e. maximum change in oxidation number is observed in \(\mathrm{Cl}(+5\) to-1).
Thus, $\mathrm{Cl}$ is the element which undergoes maximum change in the oxidation state.
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