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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry1 Mark
MCQ
Physical adsorption is appreciable at $.......$ temperature.
  • ✓
    Low
  • B
    High
  • C
    Very high
  • D
    Moderate
✓

Answer

Correct option: A.
Low
Physical adsorption is appreciable at low temperature.
In physical adsorption, equilibrium is established between the adsorbate and the fluid phase. In solid or gas systems, at not too high
pressures, the extent of physical adsorption increases with increase in gas pressure and usually decreases with increasing temperature.
Since physical adsorption is an exothermic process, the rate of physical adsorption is inversely proportional to temperature.

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