The correct combination from the following statements about chemisorptionI) It is unilayered adsorptionII) It is irreversible and takes place slowlyIII) It occurs rapidlyThe correct combination is

A strong attraction resembling Ionic(or)covalent bond develops between adsorbate and adsorbent.such a process occurs slowly and it is irreversible in nature.chemical adsorption is always unilayered.A single layer of adsorbate is strongly attracted by adsorbent.In multilayers,adsorbate molecules are present over adsorbent  molecules and attractions among them can never be strong chemical forcesso chemical adsorption can never be multilayered