(A) $MnO_2$ acts as an oxidizing agent. It can oxidize $Cl^-$,$Br^-$,and $I^-$ to their respective halogens ($Cl_2$,$Br_2$,$I_2$).However,$F^-$ (fluor

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(A) $MnO_2$ acts as an oxidizing agent. It can oxidize $Cl^-$,$Br^-$,and $I^-$ to their respective halogens ($Cl_2$,$Br_2$,$I_2$).However,$F^-$ (fluoride ion) cannot be oxidized by $MnO_2$ because fluorine is the strongest oxidizing agent among halogens,and its oxidation potential is extremely high.