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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
During adsorption the $\Delta H$ is $-ve$ and the magnitude of $-ve$ value
  • A
    goes on increasing
  • ✓
    goes on decreasing
  • C
    remains same
  • D
    first increase then decreases
✓

Answer

Correct option: B.
goes on decreasing
b
During adsorption the $-ve$ value of $\Delta H$ goes on decreasing because as adsorption proceeds number of adsorption sites decreases and hence exothermicity decreases.

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