SURFACE CHEMISTRY

Formic acid solution ✘ Formaldehyde solution ✘ Acetic acid solution ✘ Acetaldehyde solution ✔ NULL ✔ NULL NULL

Prussian blue sol ✘ sol ✘ Positive sol ✘ All of these ✔ NULL ✔ NULL NULL

Colloidal sulphur ✘ Colloidal silver ✘ Colloidal gold ✘ Colloidal antimony ✔ NULL ✔ NULL NULL

Adsorbate ✘ Adsorbent ✘ Micelle ✘ Absorbent ✔ NULL ✔ NULL NULL

Enthalpy of physical adsorption is less compared to enthalpy of chemical adsorption ✘ Milk is an example of emulsion ✘ Physical adsorption increases with the increase in temperature ✘ Smoke is an aerosol ✔ NULL ✔ NULL NULL

Adsorption on solids is reversible ✘ Adsorption increases with increase in temperature ✘ Adsorption is spontaneous ✘ Both enthalpy and entropy of adsorption are negative ✔ NULL ✔ NULL NULL

Physical adsorption occurs at very low temperature and chemisorptions occur at all temperature ✘ The magnitude of chemisorption decreases with rise in temperature and physisorption increases with rise in temperature ✘ Chemisorption is irreversible and physisorption is reversible ✘ In physisorption, the activation energy of desorption is very low and in chemisorption, the activation energy of desorption is very high ✔ NULL ✔ NULL NULL

Cryolite ✘ ✘ ✘ ✔ NULL ✔ NULL NULL

The concentration at which micellisation starts ✘ The concentration at which the true solution is formed ✘ The concentration at which one molar electrolyte is present per 1000 g of the solution ✘ The concentration at which ✔ NULL ✔ NULL NULL

Absorption ✘ Adsorption ✘ Chemical reaction ✘ Both (a) and (b) ✔ NULL ✔ NULL NULL