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a
At constant pressure, physisorption increases with increase in temperature
b
At variable pressure, physisorption increases with increase in temperature
c
At constant pressure, physisorption decreases with increase in temperature
d
At variable pressure, physisorption decreases with increase in temperature
answer is C.
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Detailed Solution
Since physical adsorption is an exothermic process, it occurs more readily at lower temperatures and decreases with increase in temperature (Le-Chatelier's Principle).