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Question

I, II and III are three adsorption isotherms at three temperatures T1, T2 and T3, where x is the amount of adsorbate adsorbed per mg of the adsorbent.
The temperatures T1, T2 and T3 are in the order

A
T1<T2<T3
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B
T1=T2=T3
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C
T3<T2<T1
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D
No specific order
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Solution

The correct option is A T1<T2<T3
Adsorption is an exothermic process. As temperature increases, the extent of adsorption decreases.
Extent of adsorption (xm) is minimum at T3 and is maximum at T1.

Thus, T1<T2<T3

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