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5 - 9 классы

Al-Al(OH)3-Al2O3-Na3[Al(OH)6]-AlCl3-Al...
Answer
Fe-Fe3O4-Fe2O3-FeCl3-Fe(OH)3-Fe2O3-Fe-FeCl2...
Answer
Cr-CrCl3-Cr(OH)3-K9[Cr(OH)6]-Cr(SO4)3-Cr(OH)3-Cr2O3-CrO3-Na2CrO4-Na2Cr2O7...
Answer

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