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Fe2+ or [Fe(H2O)6] 2+
pale green solution
Fe3+ or [Fe(H2O)6] 3+
yellow solution
Fe(OH)2(s)
pale green precipitate
Fe(OH)3(s)
orange- brown precipitate
Cu2+ or [Cu(H2O)6] 2+
pale blue solution
[Cu(NH3)4(H2O)2] 2+
dark blue solution
CuCl4 2–
yellow solution
Cu(OH)2(s)
pale blue precipitate
Cr3+ or Cr(H2O)6] 3+
purple solution
Cr(H2O)5SO4 + when sulfuric acid is present
green solution
Cr2+ or Cr(H2O)6 2+
blue solution
[Cr(NH3)6] 3+
purple solution
[Cr(OH)6 ] 3–
dark green solution
Cr(OH)3(s)
grey-green precipitate
Cr2O7 2–
orange solution
Mn2+ (aq)
pale pink solution
MnO4 –
purple solution
Mn(OH)2(s)
light brown precipitate