Chemistry past papers › 9701/21/O/N/25

9701/21/O/N/25 Question 1

Chemistry October/November 2025 Paper 21 · 20 marks · Particles in the atom and atomic radius, Isotopes, Mass spectrometry, Electrons, energy levels and atomic orbitals, Oxidation and reduction, Oxidation numbers, Balancing redox equations, Intermolecular forces, Dynamic equilibrium, Le Chatelier's principle, Period 3 chlorides with water

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Question 2

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