Class 10 Science: Chapter 5 - Periodic Classification of Elements (Jay per Vikram ke panch mein part vigyan)

This topic covers the periodic classification of elements as per the Class 10 Science syllabus, including early attempts like Dobereiner's triads and Newlands' law of octaves, Mendeleev's periodic table, and the modern p…

• A chemical reaction is recognised by change in state, colour, temperature, gas evolution, or precipitate formation.
• A balanced equation obeys the law of conservation of mass — atoms are neither created nor destroyed.
• Combination reactions have many reactants → one product; decomposition reactions have one reactant → many products.

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