Which of the following statements is correct with respect to physisorption?a.It is reversibleb.ΔH < 0c.All of the aboved.It is spontaneous

The correct answer is c. All of the above.

Here's why:

a. Physisorption is reversible. This means it can go back and forth between the adsorbed and desorbed state.

b. ΔH < 0. This means the process is exothermic, i.e., it releases heat. In physisorption, weak van der Waals forces are involved, and when these forces of attraction are established, energy is released, making ΔH negative.

d. It is spontaneous. This means the process can occur without any external influence. Physisorption usually occurs spontaneously at low temperatures.

So, all the given statements a, b, and d are correct with respect to physisorption.