Pre University and Higher Secondary Examinations of Punjab, Haryana, Himachal Prodesh, Chandigarh, Jammu and Kashmir Table of Contents Chapter 1. Units of Measurements 2. Laws of Chemical Combination 3. Percentage Composition 4. Mole Concept 5. Empirical and Molecular Formulae 6. Gas Laws 7. Diffusion of Gases 8. Molecular Weights 9. Equivalent Weights 10. Atomic Weights 11. Oxidation and Reduction 12. Volumetric Analysis 13. Problems Based on Equations 14. Problems Based on Equations (Contd.) 15. Problems Based on Equations (Contd.) 16. Measurement and Uncertainty 17.