Methylene blue in aqueous solution, is adsorbed on activated charcoal at 25°C.For this process, the correct statement is

Adsorption is  spontaneous (ΔG<0) andtakesplacewith  decrease in entropy (due to decrease in disorder). Thus, ΔS<0 Since,  ΔG=ΔH−TΔS⇒ΔH=(ΔG+TΔS) Since, both ΔG<0, and ΔS<0 Hence, ΔH<0 (exothermic) By Le-Chatelier's principle, increase in temperature, decreases adsorption.