JEE Mains Model Paper 8

In a chemical reaction platinum is used as a catalyst. Since platinum is a very rare metal to increase theavailable surface area small spheres of platinum are used for the reaction. The catalyst action happensdue to the phenomenon of adsorption. The reactant molecules are absorbed on the surface where theymay react with each other easily. Assuming that the surface of these spheres is very smooth even atmolecular level, what is the number of degrees of freedom with respect to translation for a adsorbedhydrogen molecule [Take appropriate assumptions]