Question

1)Mg+?=MgO; 2) Fe (OH)3=Ce2O3+?; 3) Zn+?=Cu+ZnCI2;4) ?+HCI=ZnCI2+?

Answer 1

1)Mg+H2O=MgO+H2
2Mg+O2=2MgO
2) 2Fe (OH)3=Fe2O3+3H2O
3) Zn+CuCl2=Cu+ZnCI2
4) Zn+2HCI=ZnCI2+H2