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a
chemisorption is shown by only those gases which react with the adsorbent.
b
enthalpy of chemisorption is high, i.e. 80-240 kJ mol-1
c
it is favoured by low temperature
d
None of the above
answer is C.
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Detailed Solution
Chemisorption is an exothermic process and it is very slow process at low temperature on the account of high energy of activation. Therefore, with increase of temperature chemisorption increases usually high pressure is also favourable for chemisorption.