7. Richa uses a rough charcoal surface instead of a flat surface to adsorb ' \( x \) ' \( g \) of \( N_{2} \) at room temperature \( \left( T _{ o }\right) . \Delta H _{\text {adsorption }} \) was found to be very low and positive. (i) Why is a rough surface better than a flat surface for adsorption. (assume all the other variables are the same) (ii) Is the adsorption physical or chemical? Give a reason for your answer. (iii) If \( x+20 g \) of \( N_{2} \) is adsorbed at temperature \( T 1 \), then compare \( T_{o} \) and \( T_{1} \).

Question

7. Richa uses a rough charcoal surface instead of a flat surface to adsorb ' \( x \) ' \( g \) of \( N_{2} \) at room temperature \( \left( T _{ o }\right) . \Delta H _{\text {adsorption }} \) was found to be very low and positive. (i) Why is a rough surface better than a flat surface for adsorption. (assume all the other variables are the same) (ii) Is the adsorption physical or chemical? Give a reason for your answer. (iii) If \( x+20 g \) of \( N_{2} \) is adsorbed at temperature \( T 1 \), then compare \( T_{o} \) and \( T_{1} \).