Extent of physisorption of a gas increases with ………. .

Extent of physisorption of a gas increase with: (a) increase in temperature (b) decrease in temperature (c) decrease in surface area of adsorbent (d) decrease in strength of van der Waals forces

The rate of physisorption increases with

Rate of physisorption increases with

Rate of physisorption increases with

Rate of physisorption increases with :