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HgCl2(s)+Hg(l)HgzCl2(s)
2Na+Cl22NaCl(s)
4HCl(aq)+MnO2(s)MnCl2(aq)+Cl2(g)+2H2O(l)
Zn(s)+H2SO4(aq)ZnSO4(aq)+H2(g)
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