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79. Solving a chemistry problem
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1. Colourless crystals of salt were given to conduct the study; after a short period of exposure to air, they acquired a blue colour. The given salt was heated and the release of brown gas and the formation of a black powder were observed. When hydrogen was passed over the heated powder obtained, the appearance of a red coating of a simple metal substance was observed. Write the chemical formula and the name of the given substance. Write the equations of the reactions that were carried out during the study of its properties.
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