Write the action of it upon I)moist air                        II) conc. H₂SO
i. Action with moist air: After long exposure to moist air, a green layer of its basic carbonate is formed over it.
2Cu + H2O + CO2 + O2 ---------------> CuCO3.Cu(OH)2
ii. Action of Conc. H2SO4: When heated with conc.H2SO4Sulphur dioxide gas is formed.
Cu + 2H2SO4-------------------> Cu(NO3)2 + 2NO2 + 2H2O
