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Which one is not correct according to Langmuir adsorption isotherm at very high pressure?

Options

  1. AIt is valid for chemisorption
  2. BIn X m = - Δ H o R T + Δ S o R
  3. CX m = a b
  4. DAt very high pressure rate of adsorption > rate of desorption

Correct answer

D. At very high pressure rate of adsorption > rate of desorption

Step-by-step solution

x m   =   ap 1   +   bp at high pressure 1   +   bp ≃ bp x m   =   ap bp ⇒ x m   =   a b   =   constant At very high P, rate of adsorption = rate or desorption ∴ X m = a b = const .(K) ∴ ΔG o = − 2 .303 log K or ΔH o − TΔS o = − 2 .303 log K

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