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Question

The given graphs/data I, II, III anad 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
l is physisorption and II is chemisorption
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B
lV is chemisorption and II is chemisorption
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C
l is physisorption and III is chemisorption
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D
lV is chemisorptionand III is chemisorption
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Solution

The correct option is A l is physisorption and II is chemisorption
Under mild conditions of temperature extent of physisorption decreses with increasing temperature so graph (I) is correct. A initial temperature provided meets the necessary activation energy needed for chemical bond formation for chemisorption so graph (II) is also correct. Finally graph (IV) is correct for chemisorption as plot is now of potential energy vs distance of molecule from surface. Hence , answer is (A,C).

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