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JEE Main levelSingle correct optionDifficulty 2 of 3sc012

In the Langmuir isotherm $θ = \frac{K p}{1 + K p}$ , the order of adsorption with respect to gas pressure at very low and at very high pressure is, respectively:

Azero order and first order
Bfirst order and first order
Cfirst order and zero order
Dsecond order and zero order

Answer: C

At low pressure

K p ≪ 1

, so

θ \approx K p

, which is first order in

p

. At high pressure

K p ≫ 1

, so

θ \to 1

regardless of

p

, which is zero order.

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