Answered

In the thermal decomposition of copper carbonate, the black solid left behind weights less than the original copper carbonate . Why?



Answer :

pyromorphite
CuCO₃ ---T--> CuO↓ + CO₂ ↑ 

CO₂ escapes to the atmosphere (it's a gas)
vaibhavay
It is so bcs of law of conservation of mass

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