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 which turns the limewater milky
Identify X, Y, Z and also write the chemical reaction.
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Compound x is CaCO3
Compound y is CaO
Compound z is CO2
CaCO3==CaO+CO2
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