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Q. The metal that is usually extracted from sea water is
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Q. Iron rusting, chemical or physical change
Q. Emission of β-particle from an atom
Q. Brass gets discoloured in air because of the presence of which of the following gases in air?
Q. The main chemical constituent of clay is
Q. The acid used in batteries is
Q. The weight of a rusted iron object is _________ that of an unrusted one
Q. Which method will be employed to test the hardness of water?
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