1)Э+2H2O---->Э(OH)2+H2
2)Mg2Э+4HCl--->ЭН4 + 2 MgCl2 ( Это углерод?)
3)2ЭS2+7O2---t--->2ЭO3+4SO2(газ)
4)4KЭО4---t--->K2ЭO4+O2(Газ)+MnO2 ( марганец?)
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