(A) $ClO_3$ is an odd-electron molecule with an unpaired electron,making it paramagnetic. $Cl_2O_6$ exists as a dimer in the solid state as $[ClO_2]^+

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They are paramagnetic and diamagnetic,respectively.

(A) $ClO_3$ is an odd-electron molecule with an unpaired electron,making it paramagnetic. $Cl_2O_6$ exists as a dimer in the solid state as $[ClO_2]^+[ClO_4]^-$,which contains only paired electrons,making it diamagnetic. Therefore,$ClO_3$ is paramagnetic and $Cl_2O_6$ is diamagnetic.