Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?

• A

  $\mathrm{\Delta H}>0,\mathrm{\Delta S}>0$
• B

  $\mathrm{\Delta H}<0,\mathrm{\Delta S}>0$
• C

  $\mathrm{\Delta H}>0,\mathrm{\Delta S}<0$
• Correct answer
  D

  $\mathrm{\Delta H}<0,\mathrm{\Delta S}<0$

Hence, the correct answer is option: 'D'.