The number of incorrect Statement/s from the following is are _____________
A. Water vapours are adsorbed by anhydrous calcium chloride.
B. There is a decrease in surface energy during adsorption.
C. As the adsorption proceeds, ΔH becomes more and more negative.
D. Adsorption is accompanied by decrease in entropy of the system

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answer is 1.

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Detailed Solution

Water vapour are absorbed by CaCl₂ not adsorbed during adsorption surface area a decreased
$ΔH$ becomes –v e in adsorption
Entropy decrease during adsorption due to accumulation
Only given statement 1 is wrong in the above question

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