(1)4HCl(浓)+MnO 2 MnCl 2 +Cl 2 ↑+2H 2 O (2)6I - +ClO 3 - +6H - =3I 2 +Cl - +3H 2 O (3)2H 2 O 2 2H 2 O+O 2 ↑或2KMnO 4 K 2 MnO 4 +MnO 2 +O 2 ↑ (4)能；Q=c(Pb 2+ )·c(I - ) 2 =1/2×0. 001×(0.01) 2 = 1.25×10 -8 >7. 0×10 -9 ，可以生成PbI 2 沉淀
