Cl2+O2=? H2SO4+NaOH= ZnO+?=ZuCl2+? CuO+H2SO4=?+?

Question

Cl2+O2=?
H2SO4+NaOH=
ZnO+?=ZuCl2+?
CuO+H2SO4=?+?

Answer 1

2Cl2+7O2=2Cl2O7
H2SO4+2NaOH=Na2SO4+2H2O
ZnO+FeCl2=ZnCl2+FeO
CuO+H2SO4=CuSO4+Н2O