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# The reaction , $3Cl_O(aq) \longrightarrow ClO_{3(ag)}^{-}+2 Cl^{-}_ {(aq)}$ is an example of

$(a)\;\text{Oxidation reaction} \\ (b)\;\text{Reduction reaction} \\(c)\;\text{disproportionation reaction } \\(d)\;\text{decomposition reaction}$

The oxidation state of chlorine$(cl)$ in reactant $(clo^{-})$.is $+1(x-2=-1;x=+1)$
The oxidation states of chlorine (cl) in products are $+5(in clO_3^{-})$ and $-1$(in $cl^{-}$).
From this we find that chlorine gets oxidised (changes from +1 to +5 state ) and also reduced (changes from +1 to -1 state).
A reaction like this is called a disproportionation reaction.
Hence c is the correct answer.