Class 12

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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