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I- Colors of metal ions from Group 1, 2 and 3
II- Colors of transition metals
Part I- Metal Ions
Fe2+ ⇒ Pale green
Fe3+ ⇒ Yellow-brown
Cu2+⇒ Blue
Cr3+ ⇒ Green
Ni2+ ⇒ Green
Mn2+ ⇒ Pale-pink/Colorless
Zn2+ ⇒ Colorless
Part II- Transition Metals
Sc3+ ⇒ colorless
Ti3+ ⇒ purple
V3+ ⇒ green
Colors of Vanadium ions
VO2+ ⇒ Yellow *oxidation state: +5
VO2+ ⇒ Blue *oxidation state: +4
V2+ ⇒ Violet
Colors of Manganese ions
Mn(OH)3 ⇒ Brown *oxidation state: +3
MnO2 ⇒ Black *oxidation state: +4
MnO42- ⇒ Dark green *oxidation state: +6
MnO4- ⇒ Purple *oxidation state: +7
Colors of Chromium ions
Cr2+ ⇒ Blue
CrO42- ⇒ Yellow *oxidation state: +6
Cr2O72-⇒ Orange *oxidation state: +6
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