Question

A green solid which on heating turns black

Answer 1

Answer:

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Answer 2

Answer:

the green solid p is copper carbonate or the curpic carbonate salt with the copper in $(+2)$ oxidation state on heating the copper carbonate, it breaks down into two substances, that is copper ll. oxide which is black solid (Q) and colourless carbon dioxide gas (X). it is an endothermic reaction