CuO->Cu->СuCl2->CuOH2->CuSO4

Question

CuO->Cu->СuCl2->CuOH2->CuSO4

Answer 1

CuO+H2=Cu+H2O
Cu+HgCl2=CuCl2+Hg
CuCl2+2NaOH=Cu(OH)2+2NaCl
Cu(OH)2+H2SO4=CuSO4+2H2O