The reaction: $P C l_{3} + 3 H_{2} C_{2} O_{4} \to H_{3} P O_{3} + 3 C O + 3 C O_{2} + 3 H C l$ is a disproportionation reaction.
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Solution

The correct option is A 1
The reaction $P C l_{3} + 3 H_{2} C_{2} O_{4} \to H_{3} P O_{3} + 3 C O + 3 C O_{2} + 3 H C l$ is a disproportionation reaction.
In this reaction, the oxidation number of C changes from +3 (in $H_{2} C_{2} O_{4}$ ) to +2 (in CO) and +4 (in $C O_{2}$ ).
Thus, out of 2 C atoms of oxalic acid, one C atom is oxidized and other C atom is reduced.

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