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[tex]1) MnCl _{2} +HCl=\\2)MnO _{2} +KOH=\\3)Co+CO=\\4)CoO+C\\5)Ni+Si=\\6)FeCl _{2}+(NH _{4} ) _{2} S= \\7)FeCl _{3} +CuO=[/tex]
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