Question

The statement given below is incorrect. Write the correct statement.

Copper carbonate on strong heating leaves behind a residue which is green in colour.

Answer 1

Copper carbonate (CuCO₃) is initially green in colour which upon strong heating results in the formation of copper oxide (CuO) which is black in colour and carbon dioxide gas (CO₂).

• It is also a type of decomposition reaction.

CuCO₃(s)$\stackrel{\mathrm{Strong}\mathrm{heat}}{\to }$CuO(s) +CO₂ (g)

• As the colour of the copper oxide is black, not green.

Correct statement: Copper carbonate on strong heating leaves behind residue which is black in colour.