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The given graphs/data I, II, III and IV ...

The given graphs/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

A

I is physisorption and II is chemisorption

B

I is physisorption and III is chemisorption

C

IV is chemisorption and II is chemisorption

D

IV is chemisorption and III is chemisorption

Text Solution

Verified by Experts

The correct Answer is:
A, C
In physisorption, with the increase of temperature and pressure, the rate of adsorption decreases because according to Le Chatelier.s principle, increase of temperature and pressure will shift the equilibrium to the left.
Adsorbate + Adsorbent `rArr` Adsorption + Heat
This is shown in Graphs I and III , whereas in case of chemisorption, there is a formation of strong bond between the adsorbate and the adsorbent and so the rate of adsorptoin increases with increase in temperature (Graphs II and IV).
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