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Chemistry notes for Class 11 and 12
Physical, organic and inorganic, written from the NCERT outward. Structure first, then the exam patterns that keep coming back.
- Class 11 · Practice set
Stoichiometry and Concentration
Stoichiometry questions in JEE are rarely about the mole itself. They are about applications: back titration, double titration with an indicator change, the strength of oleum, the volume strength of hydrogen peroxide, and eudiometry. This set works through twenty-four such problems, with the full solution shown for each.
- Class 11 · Chapter notes
Chemical Bonding and Molecular Structure
Atoms bond to reach a lower energy, not to obey a rule. From there everything follows: ionic bonding when one atom takes electrons outright, covalent when they are shared, VSEPR to predict the shape from electron pairs, hybridisation to explain it, and molecular orbital theory for the cases where the simpler pictures fail.
- Class 11 · Chapter notes
Classification of Elements and Periodicity
The periodic table is a map, not a list to memorise. Four trends run through all of it, and all four come from one idea: how hard the nucleus pulls on the outermost electron. Nuclear charge rises across a period while shielding stays roughly constant, so the pull tightens; down a group a new shell wins, and the pull weakens.
- Class 11 · Chapter notes
Structure of the Atom
The atom was taken apart and rebuilt over about thirty years. Cathode rays gave the electron, scattering gave the nucleus, and the hydrogen spectrum showed energy comes in steps. Bohr fixed the steps by decree; de Broglie and Heisenberg explained why they exist, and the quantum model replaced orbits with orbitals described by four quantum numbers.
- Class 12 · Chapter notes
Biomolecules
The Class 12 chemistry treatment of biomolecules is about structure and tests rather than function. Carbohydrates are classified by what they hydrolyse into and identified by reducing tests, proteins by their linkage and levels of structure, and nucleic acids by their three components. Most marks come from tables you can learn directly.
Read it, then play it.
In the app every one of these chapters becomes a game you play, a short read, then practice that tests you at every step. A full chapter, understood, in 45 to 60 minutes. Free to start.