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Chemistry 3.4
A-level
Question | Answer |
---|---|
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 |