a compound X which is green in colour decomposes to form oxide of metal y which is black in colour and a gas Z is evolved when turns the lime water milky identify x, y, z and also write the chemical reaction..
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《X》Green Carbonate salt is copper carbonate《 CuCO3 》
《Y》 is a black copper oxide《CuO》 its formed by thermal decomposition of carbonate and carbon dioxide gas evolves which is 《Z》gas which turns lime water milky
1- CuCO3=> CuO + CO2
2- CO2 + Ca(OH)2=> CaCO3 + H2O
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