class 11-12 chemistry

Class 11 · Physical Chemistry Redox Reactions (Class 11): Oxidation Numbers and Balancing That Works Balancing a redox equation is a procedure, not an insight. Follow the same six steps every time and the hardest equation in the chapter takes four minutes. Class 11 · Physical Chemistry · Boards + JEE + NEET · Published 27 August 2026 In short: Assign oxidation numbers by rule rather than intuition, identify which species gains and which loses electrons, split into half reactions, balance atoms then oxygen with H2O then hydrogen with H+, balance charge with electrons, and only then combine. In basic…

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Class 11 · Organic Chemistry Hydrocarbons (Class 11): Alkanes, Alkenes and Alkynes in One Framework Saturated carbon has nothing to offer an electrophile, so alkanes substitute. Unsaturated carbon has a loose π cloud, so alkenes and alkynes add. Everything else in the chapter follows from that difference. Class 11 · Organic Chemistry · Boards + JEE + NEET · Published 27 August 2026 In short: Alkanes react by free-radical substitution and need light or heat. Alkenes and alkynes react by electrophilic addition because the π electrons are exposed and available. Markovnikov’s rule is not a rule to memorise — it…

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Class 12 · Organic Chemistry Amines (Class 12): Basicity, Reactions and How to Tell Them Apart The basicity order students memorise is the one that is true in water, for a reason most answers leave out — and the missing reason is exactly what the question is testing. Class 12 · Organic Chemistry · Boards + JEE + NEET · Published 27 August 2026 In short: Basicity depends on three competing effects: the inductive push of alkyl groups, steric hindrance around nitrogen, and solvation of the resulting ammonium ion. In the gas phase only the first matters, so 3° >…

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Class 12 · Organic Chemistry Alcohols, Phenols and Ethers (Class 12): Reactions and Conversions One idea — how well the negative charge left behind is stabilised — explains the acidity order, the substituent effects and half the reaction outcomes in this chapter. Class 12 · Organic Chemistry · Boards + JEE + NEET · Published 27 August 2026 In short: Phenol is far more acidic than an alcohol because the phenoxide ion delocalises its negative charge into the ring, while an alkoxide cannot. Electron-withdrawing groups make it more acidic still; electron-donating groups make it less. Almost every acidity question in…

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Class 12 · Inorganic Chemistry p-Block Elements (Class 12): Groups 15 and 16 Without the Memorising Most of what looks like an arbitrary list of facts follows from three trends — size, electronegativity and the inert pair effect. Learn the trends and the facts stop needing separate storage. Class 12 · Inorganic Chemistry · Boards + JEE + NEET · Published 27 August 2026 In short: Group 15 and 16 questions almost always reduce to one of four ideas: the small size and absent d-orbitals of the first member, the inert pair effect down the group, the stability of the…

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Class 12 · Physical Chemistry Solid State (Class 12): Unit Cells, Packing and the Density Numerical Four numbers carry most of this chapter — atoms per unit cell, edge length, radius and density. Get the relationships between them straight and the numericals stop being guesswork. Class 12 · Physical Chemistry · Boards + JEE · Published 27 August 2026 In short: Almost every Solid State numerical is the same equation rearranged: d = zM / (a3 NA). What changes is z (atoms per unit cell) and how a relates to r. Learn z and the a–r relation for the three…

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