Free Chemistry guides, exam strategies, and subject deep-dives written by PK Sir — IIT Roorkee alumni with 18+ years of coaching experience. New post every Monday.
Physisorption vs chemisorption, the Freundlich & Langmuir isotherms, why a catalyst never shifts equilibrium, promoters vs poisons, colloid classification, the Hardy-Schulze rule and gold number — PK Sir's complete guide to Surface Chemistry, with 8 exam traps and an FAQ.
Hand-picked Chemistry guides, exam strategies and subject explainers for IIT JEE and NEET aspirants.
The real aqueous basicity order 2° > 1° > 3° > NH3, why aniline is weaker than ammonia, Gabriel synthesis, Hofmann bromamide degradation and the Hinsberg test — with 8 exam traps.
Organic ChemistryWhy phenol is more acidic than alcohol, the real 1°/2°/3° acidity order, Williamson ether synthesis, Kolbe's & Reimer-Tiemann reactions — with 8 exam traps.
Organic ChemistrySN1 vs SN2 mechanisms, Walden inversion, Zaitsev's rule, why haloarenes resist substitution, Finkelstein & Sandmeyer reactions — with 8 exam traps.
Physical ChemistryBohr model, de Broglie equation, Heisenberg's Uncertainty Principle, the four quantum numbers, and orbital filling rules — with 8 exam traps.
Inorganic ChemistryElectronic configuration exceptions, colour and magnetism, variable oxidation states, KMnO4/K2Cr2O7 chemistry and lanthanoid contraction — with 8 exam traps.
Organic ChemistryNucleophilic addition, Aldol condensation vs Cannizzaro, the iodoform test, HVZ reaction and carboxylic acid acidity — with 8 exam traps.
NEET Strategy11.21 lakh qualified out of nearly 20 lakh candidates. Counselling timelines, dropper-year strategy, and why Chemistry is your biggest lever right now.
Physical ChemistryRaoult's law, elevation of boiling point, depression of freezing point, osmotic pressure and the van't Hoff factor — with 8 exam traps.
Physical ChemistryUnit cell packing efficiencies, the universal density formula, tetrahedral & octahedral voids, Schottky & Frenkel defects — with 8 exam traps.
Inorganic ChemistryGroup 13–18 trends, anomalous behaviour of B, N, O, F, oxoacids of nitrogen, phosphorus & chlorine, noble gas compounds — with 8 exam traps.
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