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2Na(+) +2OH(-) +2H(+) +SO4(2-)=2Na(+) +SO4(2-) +2H2O;
2OH(-) +2H(+)=2H2O;
b)Zn+2HCl=ZnCl2+H2;
Zn+2H(+) +2Cl(-)=Zn(2+) +2Cl(-) +H2;
Zn+2H(+)=Zn(2+) +H2;
c)ZnCl2+K2S=ZnS+2KCl;
Zn(2+) +2Cl(-) +2K(+) +S(2-)=ZnS +2K(+) +2Cl(-);
Zn(2+) +S(2-)=ZnS.