# Which substance can be easily adsorbed by charcoal?

Which substance can be easily adsorbed by charcoal?

1. $$\ce{CO2}$$
2. $$\ce{SO2}$$
3. $$\ce{H2}$$
4. $$\ce{He}$$

I thought the answer was (3) because the intermolecular forces are weak. So charcoal can easily adsorb hydrogen. But answer given is (2) which has strong intermolecular forces. Is my reasoning wrong?

• The adsorption occurs because of the intermolecular forces, not despite them. – Ivan Neretin Mar 6 '16 at 10:57

If you were to rank these in order of highest dispersion forces to lowest, that list would read: $$\ce{SO2>CO2>H2>He}$$