[Cr(H2O)6]+3: Ruby solution (looks green)
Addition of CO3: Cr(OH)3(H2O)3 + CO2- Green precipitate and fizzing/effervesence
Addition of dropwise ammonia: Cr(OH)3(H2O)3- green precipitate
Addition of excess or conc ammonia: [Cr(NH3)6]+3- purple solution
Addition of dropwise NaOH: Cr(OH)3(H2O)3- green precipitate (amphoteric)
Addition of excess NaOH or KOH: [Cr(OH)6]-3- green solution
Addition of zinc/HCl: [Cr(H2O)6]+2- blue solution
Addition of KOH, H2O2: CrO4-2- yellow solution which goes to Cr2O7-2 orange solution when H+ ions are added
Colours of Chromium: Ruby (looks green), green, purple, blue, yellow, orange
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