Question

Cu -->CuO ---> CuCl2-->Cu(OH)2

Cu<---CuO
CuO<----CuCl2
CuCl2<-----Cu(OH)2

Answer 1

1)2Cu+O2--->2CuO 2) CuO+2HCl-->CuCl2+H2O 3) CuCl2+2NaOH--->2NaCl+Cu(OH)2