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13]7. A reddish brown coloured metal, used in electrical wires, when powdeand heated and heated strongly in an open china dish, its colour turnsblack. When hydrogen gas in passed over this black substance, it regaioriginal colour. Based on the above information answer the followingquestion.(i)Name the metal and the black coloured substance formed.(i) Write balanced chemical equations for both the reactions. [3] |
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Answer» i) The reddish brown coloured metal is copper metal (Cu).When copper metal is heated in air, it forms black coloured compound. This black coloured compound is copper oxide or copper (II) oxide (CuO).2Cu + O2-------heat-------> 2CuO ii) CuO + H2 ------------->Cu+H20 |
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