Adsorption Applications:

1. Gas masks: Activated charcoal adsorbs toxic war gases ($Cl_{2}$, phosgene, mustard gas)
2. Water purification: Activated charcoal removes organic pollutants, taste/odor compounds, chlorine
3. Sugar decolorization: Animal charcoal (bone char) adsorbs brown coloring from sugar
4. Silica gel desiccators: Adsorbs moisture to protect electronics, pharmaceuticals, food
5. Ion exchange resins: Adsorb ions for water softening (remove $Ca^{2+}$, $Mg^{2+}$)
6. Chromatography: All forms (TLC, column, GC, HPLC) depend on differential adsorption

Catalysis Applications: 7. Haber process: Fe catalyst → $NH_{3}$ synthesis → fertilizers 8. Contact process: $V_{2}O_{5}$ catalyst → $SO_{3}$ → $H_{2}SO_{4}$ (industrial acid) 9. Catalytic converter: Pt/Pd/Rh catalyze combustion of CO, NOₓ, hydrocarbons in car exhaust 10. Hydrogenation: Ni/Pd/Pt catalyze oil hardening (margarine, vanaspati production) 11. Zeolite cracking: Zeolite catalysts crack heavy petroleum fractions to petrol/diesel

Colloid Applications: 12. Blood clotting: $FeCl_{3}$ coagulates blood colloids — used as astringent in minor cuts 13. Water treatment: Alum [KAl($SO_{4}$)_{2}] coagulates negatively charged clay/mud ($Al^{3+}$ = high coagulating power) 14. Sewage treatment: Electrolytic coagulation of sewage colloids 15. Smoke removal (Cottrell precipitator): Electrostatic precipitation of charged smoke/dust in industrial chimneys 16. Photographic film: Gelatin (protective colloid) stabilizes AgBr/AgCl crystals 17. Kidney dialysis: Hemodialysis removes urea/creatinine from blood using semi-permeable membranes

Emulsion Applications: 18. Food: Milk, butter, cream, mayonnaise, ice cream 19. Pharmaceuticals: Drug delivery emulsions (improved absorption) 20. Cosmetics: Vanishing cream (O/W), cold cream (W/O), foundation