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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?
A
C
B
S
C
H
D
Cl
Detailed Solution
$KClO_3 + H_2C_2O_4 + H_2SO_4 \rightarrow K_2SO_4 + KCl + CO_2 + H_2O$
Cl: +5 in $ClO_3^-$ → −1 in $Cl^-$, a change of 6 units.
C: +3 in oxalic acid → +4 in $CO_2$, a change of 1 unit.
S (+6) and H (+1) do not change.
So chlorine undergoes the maximum change.
Cl: +5 in $ClO_3^-$ → −1 in $Cl^-$, a change of 6 units.
C: +3 in oxalic acid → +4 in $CO_2$, a change of 1 unit.
S (+6) and H (+1) do not change.
So chlorine undergoes the maximum change.