Question

1) HCl -> ZnCl2 -> Zn(OH)2 -> ZnO 2) Cu -> CuO -> CuCl2 -> Cu(OH)2 -> CuSO4

Answer 1

1) Zn + 2HCl -> ZnCl2 + H2
    ZnCl2 + 2NaOH -> Zn(OH)2 + 2NaCl
    Zn(OH)2 -> ZnO + H2O

2) 2Cu + O2 -> 2CuO
    CuO + 2HCl -> CuCl2 + H2O
    CuCl2 + 2NaOH -> Cu(OH)2 + 2NaCl
    Cu(OH)2 + H2SO4 -> CuSO4 + 2H2O