• # question_answer Which of the following statements is correct tor the spontaneous adsorption of a gas? A) $\Delta S$is negative and therefore$\Delta H$should be highly positive.B)  $\Delta S$ is negative and therefore,$\Delta H$should be highly negative.C) $\Delta S$is positive and therefore$\Delta H$should be negative.                            D)  $\Delta S$is positive and therefore $\Delta H$should also be highly positive.

For adsorption $\Delta S<0$and for a spontaneous change$\Delta G=-ve$ Hence$\Delta \Eta$should be highly negative which is clear from the equation $\Delta G=\Delta H-T\Delta S$ $=-\Delta \Eta -\Tau (-\Delta S)=-\Delta H+T\Delta S$ So if $\Delta \Eta$is highly negative, $\Delta G$will also be -ve,