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Follow the carbon count through the Krebs cycle, see where NADH, FADH₂, GTP and CO₂ come from, and learn how NEET tests the numbers.

PV = nRT fails at high pressure and low temperature. Learn why, how the compressibility factor Z measures it, and how van der Waals' a and b fix it.

Understand torque as the turning effect of force, angular momentum as rotational momentum, and why conserving L makes a skater speed up, with a fully worked example.

Identical or distinct objects, labelled or unlabelled boxes? Learn the stars and bars method and the grouping formulas for JEE, with worked examples.

Glycolysis in ten steps: why 4 ATP becomes a net 2, where NADH appears, and how NEET tests it.

Why does water boil at 373 K when heavier H₂S boils near 213 K? Learn hydrogen bonding, why ice floats and how ortho and para isomers differ.

Why the same rod is easy to spin about its middle and hard about its end, and how the parallel-axis theorem I = I₍cm₎ + Md² lets you shift axes without integrating.

Learn to count arrangements when people must sit together or apart, using gluing, subtraction and the gap method, with fully worked JEE examples.

Why does RuBisCO sometimes pick up oxygen instead of CO₂? Understand photorespiration, its three organelles, and why C4 plants escape it.

Why is O₂ attracted to a magnet? Learn how molecular orbitals form, how to calculate bond order, and how to predict magnetic behaviour step by step.

How the C4 pathway pumps CO₂ into bundle sheath cells, why photorespiration nearly disappears, and the exact ATP cost, explained for NEET.

Learn how to find the hybridisation of any atom in seconds using the steric number, and how s-character controls bond length and acidity.

Why does a bursting shell's centre of mass keep its parabola? Learn the weighted-average idea, F_ext = M a_cm, and the boat trick for NEET and JEE.

A simple swap test that tells you whether a counting problem needs nPr or nCr, with worked JEE-style examples and the common traps.