Read the Assertion and Reason below and choose the correct option. — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Adsorption is a spontaneous process, so Gibbs free energy change (ΔG) is negative. It involves bond formation or attractive interactions that release heat, meaning it is exothermic (ΔH < 0). The gaseous adsorbate molecules lose translational freedom when binding to the surface, causing a decrease in entropy (ΔS < 0). The reason correctly explains these thermodynamic signs. Therefore, correct answer is A.