JEE Main 2023 — Surface Chemistry Question with Solution

$$\to$$ When moisture is added in anhydrus CaCl₂ then absorption occurs.

$$\to$$ When silica gel is kept in presence of moisture then it get's wet from outside only so it is a example of adsorption.

Option C :

$$\Delta$$H is always negative for adsorption. As the adsorption proceeds $$\Delta$$H becomes less and less negative, ultimately becomes equal to T$$\Delta$$S and $$\Delta$$G becomes zero.

So, statements (A) and (C) are incorrect.