Selected reactions of Cr & its compounds

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Last updated 3:20 AM on 9/11/26
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8 Terms

1
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Color of Cr2O7²-

Orange

2
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Compound, colour & type of rxn: Cr2O7²- in KI (aq)/acidic Fe²+

  • [Cr(H2O)6]³+ (aq)

  • Green acidic

  • Reduction (KI)


3
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Compound, colour & type of rxn: [Cr(H2O)6}³+ in NH3 (aq)

  • Cr(OH)3 (s)

  • Grey green ppt, insoluble in excess NH3

  • Acid-base reaction or neutralization


4
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Compound, colour & type of rxn: [Cr(H2O)6]³+ & Na2CO3 (aq)

  • Cr(OH)3 (s)

  • Grey green ppt + CO2 (g)

  • Acid base/neutralisation


5
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Compound, colour & type of rxn: [Cr(H2O)6}³+ & NaOH (aq)

  • Cr(OH)3 (s) → amphoteric

  • Grey green ppt, soluble in excess NaOH

  • Acid base reaction


6
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Compound, colour & type of rxn: Cr(OH)3 & excess NaOH

  • [Cr(OH)6]³-

  • Dark green

    • Acid base reaction


7
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Compound, colour & type of rxn: [Cr(OH)6]³- & H2O2 & heat

  • CrO4-

  • Yellow

  • Oxidation


8
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Another way to obtain CrO4-

Cr2O7²- & OH- (basic medium)