Nitrogen gas () is physically adsorbed onto the surface of finely divided iron at . What physical or — Surface Chemistry Chemistry Question

💡 Solution & Explanation

At low temperatures, $N_2$ physisorbs via weak forces. When heated to extremely high temperatures ($773\text{ K}$), the thermal energy provides the required activation energy for $N_2$ to break its strong triple bond and undergo chemisorption (forming surface nitrides).