From the formulae listed below, choose, one, corresponding to the salt having the given description:
AgCl, CuCO3, CuSO4.5H2O, KNO3, NaCl, NaHSO4, Pb(NO3)2, ZnCO3, ZnSO4.7H2O. On heating this, salt changes from green to black.
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Solution
On heating, the salt that will change from green to black is CuCO3. Due to formation of CuO and evolution of CO2 gas: