H₂O+P₂0, HPO, Na₂O+H₂0-NaOH Zn+FeBr, ZnBr₂+ Fe Mg+H₂O-H₂+ Mg(OH)₂ Fe₂O3+H₂ H₂O+Fe Cr₂0,+Mg MgO+Cr KCIO→→KCIO,+KCI NH_NO,→N_O+H,0 NaNO,→ NaNO, +0₂ CuOH ,CO,→CuO+H,0+CO, Al(OH), Al₂O,+H₂O Al+V₂0, Al₂O,+V​