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MnO + 2H+ + 2Cl- => Mn2+ + 2Cl- + H2O
Mn2O7 + H2O => 2HMnO4 - kwasowy
Mn2O7 + H2O => 2H+ + 2MnO4-
Mn2O7 + 2KOH => 2KMnO4 + H2O
Mn2O7 + 2K+ + 2OH- => 2K+ + 2MnO4- + H2O
Cr2O3 + 6HCl => 2CrCl3 + 3H2O - amfoteryczny
Cr2O3 + 6H+ + 6Cl- => 2Cr3+ + 6Cl- + 3H2O
Cr2O3 + 6NaOH + 3H2O => 2 Na3[Cr(OH)6]
Cr2O3 + 6Na+ + 6OH- + 3H2O => 6Na+ + 2 [Cr(OH)6]3-
CrO + 2HCl => CrCl2 + H2O - zasadowy
CrO + 2H+ + 2Cl- => Cr2+ + 2Cl- + H2O
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