Verified Solution • 2025–26 Session moderate

QJEEM23Chfdbb: JEE Main 2023 Chemistry - Class 12 JEEM23Chfdbb Solution: The enthalpy change for the adsorption process and micelle…

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

Multiple Choice Options

  • A ΔHads>0 and ΔHmic<0
  • B ΔHads>0 and ΔHmic>0
  • C ΔHads<0 and ΔHmic<0
  • D ΔHads<0 and ΔHmic>0

Step-by-Step Verified Solution

Adsorption is the process of a substance (adsorbate) being attracted to a surface (adsorbent). The enthalpy change for adsorption, ΔHads\mathrm{\Delta H_{ads}} , is negative because the adsorbent and adsorbate are brought closer together, which releases energy.

Micelle formation is the process of surfactant molecules clustering together in water to form micelles. The micelles have a hydrophobic (water-repelling) core and a hydrophilic (water-loving) surface. The enthalpy change for micelle formation, ΔHmic\mathrm{\Delta H_{mic}} , is positive because the surfactant molecules are moving from a state of high entropy (dispersed in water) to a state of low entropy (clustered together).

Here is a table summarizing the enthalpy changes for adsorption and micelle formation:

Process Enthalpy change
Adsorption \mathrm{\Delta H_{ads} &lt; 0}
Micelle formation \mathrm{\Delta H_{mic} &gt; 0}

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