Extent of physisorption of a gas increases with ___________. (i) increase in temperature. (ii) the decrease in temperature. (iii) the decrease in surface area of the adsorbent. (iv) the decrease in strength of van der Waals forces.
Extent of physisorption of a gas increases with decrease in temperature. Because in physisorption particles are held to the surface by weak van der Waals' force of attraction hence on increasing temperature they get desorbed easily.
