Chemistry lectures are based on CBSE XI and XII syllabus. It also includes problems discussion related to NEET and JEE preparation.

S-Block Elements Notes and online test for NEET/JEE

General Consideration Francium is highly radioactive, its longest-lived isotope Fr-223 (half-life of only 21 minutes). Sodium, potassium, magnesium and calcium ions are found in biological fluids. Maintenance of ion balance…

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