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🧪 Chemistry  ·  Surface Chemistry  ·  NEET & JEE

In the linear plot of log(x/m) versus log P for the Freundlich isotherm, the slope equals:

Answer: 1/n.

  • A log k
  • B 1/n
  • C n
  • D k

Correct answer: B. 1/n

Explanation: Taking logs of x/m = k P<sup>1/n</sup> gives log(x/m) = log k + (1/n) log P, a straight line of slope 1/n.

Adsorption Isotherm: x/m vs PressureP (pressure)x/mlow P: x/m ∝ Phigh P: saturation plateauAt high pressure, all surface sites are occupied - the curve flattens (monolayer saturation)

A typical adsorption isotherm: x/m (mass adsorbed per gram of adsorbent) rises steeply at low pressure, then flattens into a saturation plateau as the adsorbent surface fills up.

Concept context

Explore the chemistry that happens at interfaces, from catalysts that speed up industrial reactions to colloids like milk, smoke, and gels that surround us every day.

Read the full Surface Chemistry notes →