Select the correct statement(s): (a) Physisorption is favoured by low temperature (b) Chemisorpt...

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Select the correct statement(s):
(a) Physisorption is favoured by low temperature
(b) Chemisorption is favoured by very high temperature because the process is endothermic
(c) Chemisorption increases with increase in temperature owing to high activation energy
(d) Oxygen adsorbed by charcoal can be desorbed by lowering pressure and temperature
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