Choose the correct statement for chemical ads | vedclass

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(C) In chemical adsorption (chemisorption),a chemical bond is formed between the adsorbate and the adsorbent. $1$. The enthalpy of adsorption is high,

Vedclass · Accepted Answer

Usually a unimolecular layer is formed on the adsorbent

Vedclass · Answer

(C) In chemical adsorption (chemisorption),a chemical bond is formed between the adsorbate and the adsorbent. $1$. The enthalpy of adsorption is high,typically ranging from $80-240 \ kJ \ mol^{-1}$,not less than $20 \ kJ \ mol^{-1}$. $2$. Chemical bonds are formed,not Van der Waals forces (which are characteristic of physisorption). $3$. Since chemical bonds are formed,the process is specific and usually results in the formation of a unimolecular layer. $4$. Adsorption is a spontaneous process where the surface area decreases,leading to a decrease in entropy $(\Delta S Therefore,the correct statement is that a unimolecular layer is formed.

Choose the correct statement for chemical adsorption.

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