配平下列反应式:(1)FeS2+O2→Fe2O3+SO2(2)CuSO4+KI→CuI+I2+K2SO4(3)Zn+HgO+NaOH→Hg+Na2ZnO2+H2O(4)KMnO4→K2MnO4+MnO2+O2↑(5)PbO2+Cl-→Pb2++Cl2↑(6)P4→PH3+HPO2-(7)MnO4-+Fe2++H+→Mn2++Fe3++H2O