$word_{count}$: 200

Solutions chemistry contributes ~4.5% of JEE Main marks. Focus areas: (1) Colligative property numericals — $delta_{Tf}$ and osmotic pressure are most frequently tested. Master the molar mass formula and van't Hoff factor calculations. (2) Raoult's law — calculating total pressure, vapour composition, and identifying deviation type from given data. (3) Henry's law — conceptual questions about gas solubility trends with temperature and pressure. (4) Van't Hoff factor — connecting degree of dissociation/association to i, and correcting molar mass. Time allocation: ~6 minutes per question (50 min session). Numerical approach: identify the formula, plug in values, check units. Most common mistakes: (a) forgetting i for ionic compounds, (b) confusing Kf and Kb, (c) using wrong concentration unit (molality vs molarity), (d) not converting units (g to kg for solvent mass), (e) sign errors ($delta_{Tf}$ is magnitude, not negative). Prioritise: numerical fluency with colligative property formulas, quick identification of deviation types from molecular structure, and systematic application of van't Hoff factor for electrolytes and associating solutes.