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2KI+Pb(NO3)2=PbI2+2KNO3;
2K(+)+2I(-)+Pb(2+)+2NO3(-)=PbI2+2K(+)+2NO3(-);
2I(-)+Pb(2+)=PbI2.
ZnCl2+K2S=ZnS+2KCl;
Zn(2+)+2Cl(-)+2K(+)+S(2-)=ZnS+2K(+)+2Cl(-);
Zn(2+)+S(2-)=ZnS.