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18) A reddish-brown vessel developed a green colored solid 'X'when left open in air for a long time. When reactedwith dil H2SO4, it forms a blue colored solution along with brisk effervescence due to color less and odor less gasX' decomposes to form black colored oxide'Y' of a reddish-brown metal along with gas Z, Identify "K,'Y', and Z, |
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Answer» When left open in air for a long time a vessel of copper metal reddish brown in colour combines with carbon dioxide and moisture to form green coating of basic copper carbonate CuCO3.Cu(OH)2on the surface of the vessel. Copper on reaction with dil. H2SO4forms blue coloured solution of copper sulphate (CuSO4)and CO2gas which is colourless of odourless and produces a brisk effervescence. CuCO3.Cu(OH)2decomposes to give CuO which is a black coloured oxide. Therefore, X is CuCO3.Cu(OH)2, Y is CuO, Z is CO2. |
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