Ответ:
Mg+H2SO4=MgSO4+H2
Fe+2HBr=FeBr2+H2
Hg+2Hcl=HgCl2+H2
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Ответ:
Mg+H2SO4=MgSO4+H2
Fe+2HBr=FeBr2+H2
Hg+2Hcl=HgCl2+H2