Question

Cu dissolved in nitric acid and igniting the residual copper nitrate yielded copper oxide. show chemical equation

Answer 1

cu + hno3 :- cuno3 + h2

Answer 2

Copper nitrate is a bright blue crystalline solid containing three molecules of water. When it is heated first it loses the water molecule, on further heating it decomposes to give reddish brown gas, nitrogen dioxide and oxygen. Chemically

Cu(NO3)2.3H2O --heat--> Cu(NO3)2 + 3H2O

2Cu(NO3)2 --heat--> 2CuO + 4NO2 + O2