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(A) The characteristics of physisorption are:$1.$ It is not specific in nature (it is non-specific).$2.$ Enthalpy of adsorption is low $(20-40 \ kJ \

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$2$

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(A) The characteristics of physisorption are:$1.$ It is not specific in nature (it is non-specific).$2.$ Enthalpy of adsorption is low $(20-40 \ kJ \ mol^{-1})$.$3.$ It decreases with an increase in temperature.$4.$ It results in multimolecular layers.$5.$ No appreciable activation energy is needed.Comparing these with the given statements:$A.$ Incorrect (Physisorption is non-specific).$B.$ Incorrect (Enthalpy is low).$C.$ Correct.$D.$ Incorrect (It forms multimolecular layers).$E.$ Correct.Thus,there are $2$ correct statements ($C$ and $E$).

The number of statement/s which are the characteristics of physisorption is
$A.$ It is highly specific in nature
$B.$ Enthalpy of adsorption is high
$C.$ It decreases with increase in temperature
$D.$ It results into unimolecular layer
$E.$ No activation energy is needed

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The number of statement/s which are the characteristics of physisorption is$A.$ It is highly specific in nature$B.$ Enthalpy of adsorption is high$C.$ It decreases with increase in temperature$D.$ It results into unimolecular layer$E.$ No activation energy is needed