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Chemistry 3.4

A-level

QuestionAnswer
Oxidation state Cr +3, +6
Oxidation state Mn +2, +3, +4, +6, +7
Oxidation state Fe +2, +3
Oxidation state Cu +1, +2
Oxidation state Co +2, +3
[Fe(H20)6]+2 Pale green
[Fe(H20)6]+3 Pale yellow
[Cu(H20)6]+2 Bright blue
[Cr(H20)6]+3 Dark green
[Co(H20)6]+2 Pink
[Cu(Cl)4]-2 Yellow/ Green
[Co(Cl)4]-2 Blue
[Cu(NH3)4(H20)2]+2 Royal Blue
CrO4 ^-2 Yellow
Cr2O7 ^-2 Orange
Fe ^+2 Pale green
Fe^+3 Orange
Mn^+7 Purple
Co^+2 Pink
Contact Process Vanadium Oxide V2O5 SO2 to Sulfuric acid for fertiliser
Haber Process Iron Hydrogen and Nitrogen to Ammonia
Hydrogenation Platinum Vegetable oil to margarine
Decomposition Manganese dioxide MnO2 Hydrogen Peroxide to Hydrogen and Water
Oxidation Platinum Ammonia to Nitric acid
[Cr(H2O)6]3+. + OH [Cr(H2O)3(OH)3]. Grey-Green ppt [Cr(OH)6]3-. Deep Green sol
[Fe(H20)6]+2. + OH [Fe(H20)4(OH)2] Dark Green ppt
[Fe(H20)6]+3. +OH [Fe(H20)3(OH)3] Red-brown ppt
[Cu(H20)6]+2. +OH [Cu(H20)4(OH)2] Pale blue ppt
Created by: Zoe 1
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