Here are 25 Chemistry Working Model Ideas for Class 12 — all practical, exhibition-friendly, and based on NCERT concepts
1. Electrolysis of Water – Hydrogen & Oxygen Production
Working model showing how water splits into H₂ and O₂ using graphite electrodes.
2. Galvanic Cell (Daniell Cell) Working Model
Demonstrate Zn–Cu cell, salt bridge, flow of electrons, and voltage generation.
3. Electroplating Model
Simple setup showing copper electroplating on keys/spoons.
4. pH Measurement Using Red Cabbage Indicator
Natural acid–base indicator and colour chart.
5. Activated Carbon Water Purifier
Adsorption of impurities using charcoal and sand.
6. Reverse Osmosis (RO) Model
DIY RO unit demonstrating membrane filtration.
7. Chemical Kinetics – Effect of Concentration
Iodine clock reaction or crystal dissolution rates.
8. Le-Chatelier’s Principle Demonstration
Color change reaction using CoCl₂ (pink to blue).
9. Titration Setup – Acid–Base Neutralization
Manual burette setup showing endpoint using indicator.
10. Preparation of Esters – Esterification Model
Fragrant ester formation with labelled apparatus.
11. Molecular Orbital Theory Model
Build MO diagrams with 3D models.
12. Fuel Cell (Hydrogen Fuel Cell)
Small model producing electricity from H₂ and O₂.
13. Rusting of Iron – Electrochemical Corrosion Model
Factors influencing corrosion + prevention methods.
14. Polymerization Model (Addition Polymer)
Demonstrate how monomers join to form polymers with balls & sticks.
15. Chromatography Paper Setup
Separate pigments from ink or leaves.
16. Hard Water vs Soft Water Testing Device
Show soap foam formation difference.
17. Chemical Thermometer – Endothermic vs Exothermic Reactions
Calcium chloride (exo) and ammonium nitrate (endo).
18. Nanotechnology Model (Nanoparticle Synthesis)
Create colloidal silver nanoparticle demonstration.
19. Green Chemistry Solutions Model
Biodegradable plastic from starch (bio-plastic).
20. Solar-Powered Electrolysis System
Electrolysis performed using small solar panel.
21. Air Pollution Detection Model (Using Chemical Sensors)
SO₂, CO₂, ammonia detection using indicator papers.
22. Water Hardness Removal Model (Ion Exchange Resin)
Demonstrate removal of Ca²⁺ & Mg²⁺ ions.
23. Aspirin Preparation Model
Show apparatus + reaction mechanism (acetylation).
24. Chemical Battery Model (Lemon/Salt Water Battery)
Voltage demonstration using series connection.
25. LPG Leakage Detection System (Chemical Indicator)
CuSO₄–H₂O paper that changes color on gas leakage.