<p><span style="font-size:14px"><span style="font-family:Arial,Helvetica,sans-serif">The present studies deals with the adsorption of SO₂ by manganese oxide i.e., Pyrulusite ore. Pyrulusite is used as an adsorbent for the present studies. It is found that the percentage removal of SO₂ increases with the increase in contact time, follows first order kinetics and a unimolecular layer is formed during the process. The percentage removal of SO₂ increases with increase in dosages and decreases with increase in concentration. Thermodynamic parameters such as enthalpy, entropy and free energy of the process were determined which indicates that the process is spontaneous and exothermic in nature. The negative values of S indicate the increased randomness at the solid interface during the adsorption of SO₂.</span></span></p>