ANS:B - decreases

At a given equilibrium pressure, with an increase in temperature, the concentration of adsorbed gas on a solid adsorbent typically decreases. Here's why:

• Adsorption is an exothermic process, meaning that it releases heat when molecules adhere to the surface of the adsorbent.
• At higher temperatures, the increased thermal energy disrupts the attractive forces between the gas molecules and the surface of the adsorbent.
• As a result, more gas molecules have sufficient kinetic energy to desorb from the surface and enter the gas phase.
• Therefore, at higher temperatures, the equilibrium shifts towards desorption, leading to a decrease in the concentration of adsorbed gas on the solid adsorbent.