(1)K2Cr3O7 +KI + H3PO4=K3PO4 +I2 + H2O + CrPO4(2)Cu2S +HNO3=NO +Cu(NO3)2+ H2SO4(3)FeS + H2SO4 = Fe2(SO4)3 + SO2 + H2O(4)NaSx + NaClO + NaOH =Na2SO4 + NaCl + H2O(5)An +B^(x-)=A^(y-) + B^(m)(6)Cl^(m) + OH^(-) =ClO^(n-) +Cl^(-...