The enthalpy change for the adsorption process and micelle...

The enthalpy change for the adsorption process and micelle formation respectively are

Options

A ${\Delta H}_{ads} > 0$ and ${\Delta H}_{mic} < 0$
B ${\Delta H}_{ads} > 0$ and ${\Delta H}_{mic} > 0$
C ${\Delta H}_{ads} < 0$ and ${\Delta H}_{mic} > 0$
D ${\Delta H}_{ads} < 0$ and ${\Delta H}_{mic} < 0$

Correct answer

C. ${\Delta H}_{ads} < 0$ and ${\Delta H}_{mic} > 0$

Step-by-step solution

Adsorption is exothermic process due to decrease in surface energy. Micelle formation is endothermic, it is due to For any spontaneous process entropy should always increase, hence, $\Delta S > 0$ for micelle formation and micelle formation decreases the stability of the colloidal solution so, energy of the mixture should increase which means $\Delta H > 0$ .
The adsorption process $∆ H = – ve$ . For micelle formation $∆ H$ is $+ ve$ and $∆ S$ is $+ ve$ .

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