Question

copper carbonate on heat gives copper oxide and carbon dioxide.give reasons!

Answer 1

Copper carbonate on heating dissociates to form two compounds , copper oxide and carbon dioxide . On heating Copper carbonate , a black residue is formed and a gas is released which turns lime water milky . Thus , we can conclude that the gas evolved is carbon dioxide

Answer 2

instability of compound.

Explanation:

Copper carbonate on heating in absence of air breaks down into copper oxide and carbon dioxide. The reason is the instability of compound as bigger anion can't stabilize the smaller cation.