TS EAMCET · Chemistry · Surface Chemistry
Which of the following is true for spontaneous adsorption?
- A \(\Delta G>0, \Delta S>0, \Delta H < 0\)
- B \(\Delta G>0, \Delta S>0, \Delta H>0\)
- C \(\Delta G < 0, \Delta S < 0, \Delta H < 0\)
- D \(\Delta G < 0, \Delta S>0, \Delta H < 0\)
Answer & Solution
Correct Answer
(C) \(\Delta G < 0, \Delta S < 0, \Delta H < 0\)
Step-by-step Solution
Detailed explanation
Adsorption processes are exothermic \((\Delta H < 0)\) and degree of randomness of adsorbate particles decreases, i.e. \(\Delta S < 0\). According to Gibbs' equation, \(\Delta G=\Delta H-T \Delta S\) at lower temperature adsorption becomes spontaneous, i.e. \(\Delta G < 0\)
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