Step 1: Define paramagnetism.
Paramagnetism occurs in substances with at least one unpaired electron. These substances are attracted to magnetic fields.
Step 2: Check the magnetic properties of the options.
- CO2 is diamagnetic as it has no unpaired electrons.
- ClO2 is paramagnetic as it has unpaired electrons in its molecular orbitals.
- SO2 and SiO2 are also diamagnetic.
Step 3: Apply to the options.
Since ClO2 has unpaired electrons, it is the only paramagnetic oxide among the options.
Final Answer:
\[
\boxed{\text{ClO2}}
\]