Colored Compounds in Chemistry
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Questions and Answers

Which of the following compounds would produce a green precipitate when reacted with a solution of sodium hydroxide (NaOH)?

  • Ni(OH)2 (correct)
  • FeSO4.7H2O
  • Cr2(SO4)3
  • Cr(OH)3 (correct)

    • If a compound forms a black precipitate upon reaction with hydrogen sulfide (H2S), which of the following elements is most likely present in the compound?

  • Copper (Cu)
  • Mercury (Hg)
  • Lead (Pb) (correct)
  • Silver (Ag)

    • Which of the following compounds produces a violet fume when heated?

  • I2 (correct)
  • SO2
  • NO
  • Cl2

    • Which of the following compounds would most likely be a solid with a green color?

    <p>CrCl3 (B)</p> Signup and view all the answers

    Which of the following compounds would give a green flame test?

    <p>K2MnO4 (B)</p> Signup and view all the answers

    A compound containing which of the following elements is likely to be a white solid?

    <p>Silver (Ag) (C)</p> Signup and view all the answers

    Which of the following compounds is NOT typically considered a colored gas?

    <p>SO2 (A)</p> Signup and view all the answers

    Which of the following compounds is NOT known to produce a black precipitate?

    <p>Cu2S (B)</p> Signup and view all the answers

    Based on the information provided, which compound forms a brown ring when reacted with Fe(H2O)6 (NO3)3?

    <p>Ag3AsO4 (A)</p> Signup and view all the answers

    Which of the following compounds are orange-colored in aqueous solution?

    <p>Cr2O7^2- (B), CrO4^2- (C)</p> Signup and view all the answers

    Identify the compound that turns red in a solution?

    <p>Na2CrO4 (D)</p> Signup and view all the answers

    Which compound is known as sympathetic ink and is pink when melted but black when dry?

    <p>CoCl2.6H2O (C)</p> Signup and view all the answers

    Using the provided information, what color(s) can be exhibited by MnO2?

    <p>Pink and black (A), Purple or pink (C)</p> Signup and view all the answers

    Which of the following compounds is/are known for their blood-red color?

    <p>Fe(CH3COO)3 (A), Fe(SCN)3 (C), Fe(CH3COO)3 and Fe(SCN)3 (D)</p> Signup and view all the answers

    Identify all the compounds listed that are colorless, odorless gases.

    <p>CO2, N2, O2 (A)</p> Signup and view all the answers

    Among the listed compounds, identify all the compounds that would potentially exhibit brick red color?

    <p>Ag2CrO4 and Pb3O4 (A), Ag2CrO4 and Hg2CrO4 (E)</p> Signup and view all the answers

    Which of the following compounds is generally described as having a yellow color?

    <p>SnS (A), AgBr (C)</p> Signup and view all the answers

    Which compound is identified as artificial gold?

    <p>SnS (D)</p> Signup and view all the answers

    What is the color of PbO when in cold conditions?

    <p>Light yellow (A)</p> Signup and view all the answers

    Which of the following compounds is a reddish-brown solid?

    <p>CuO (C), Fe(OH) (D)</p> Signup and view all the answers

    Which of these compounds contains arsenic and is colored yellow?

    <p>AgI (B)</p> Signup and view all the answers

    Which compound is described as having a chocolate color?

    <p>Cu[Fe(CN)6] (A)</p> Signup and view all the answers

    What color is expected from SrCrO4?

    <p>Bright Yellow (B)</p> Signup and view all the answers

    Which of the following is a characteristic of Bi2S3?

    <p>It appears brown in its solid form. (B)</p> Signup and view all the answers

    Which compound is associated with a white crystalline structure?

    <p>PbCl (D)</p> Signup and view all the answers

    Which of the following compounds contains zinc in a white precipitate form?

    <p>Zn(OH) (D)</p> Signup and view all the answers

    Identify the compound that is classified as a light blue compound.

    <p>Cu(OH) (A)</p> Signup and view all the answers

    Which compound is recognized for producing a deep blue color in its solution?

    <p>[Cu(NH₃)₄]SO₄ (B)</p> Signup and view all the answers

    Which of the following compounds contains lead in the sulfate form?

    <p>PbSO₄ (A)</p> Signup and view all the answers

    What is the primary characteristic of Prussian's blue compound?

    <p>It is a blue complex containing iron. (C)</p> Signup and view all the answers

    Identify the compound that is considered a dirty white substance.

    <p>Cd(OH) (A)</p> Signup and view all the answers

    Which of the following is NOT a silver compound associated with precipitates?

    <p>AgNO₃ (C)</p> Signup and view all the answers

    Flashcards

    Yellow Compounds

    Yellow compounds often contain sulfur, arsenic, or chromium.

    Examples of Yellow Compounds

    Some examples of yellow compounds are arsenic sulfide (As2S3), cadmium sulfide (CdS), and lead chromate (PbCrO4).

    Brown Compounds

    Brown compounds often contain iron, copper, or silver.

    Examples of Brown Compounds

    Some examples of brown compounds are iron sulfide (FeS), copper oxide (CuO), and silver arsenate (Ag3AsO4).

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    Silver Bromide

    Silver bromide (AgBr) is a light yellow precipitate.

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    Silver Iodide

    Silver iodide (AgI) is a dark yellow precipitate.

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    Lead Iodide

    Lead iodide (PbI2) is a yellow precipitate.

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    Zinc Oxide

    Zinc oxide (ZnO) is a white solid but turns yellow when heated.

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    Sodium Chromate (Na2CrO4)

    A bright yellow solid compound commonly used to color glass and pottery.

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    Chromium(III) Chloride (CrCl3)

    A reddish-brown solid compound used in the production of pigments and dyes.

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    Silver Chromate (Ag2CrO4)

    A brick-red solid compound used in the production of pigments and paints.

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    Sodium Oxide (Na2O)

    A pale yellow solid compound used in the production of glass and ceramics.

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    Ammonium Phosphate ((NH4)3PO4)

    A white solid compound used in the production of fertilizers and detergents.

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    Manganese Hydroxide (Mn(OH)2)

    A pink solid compound used in the production of batteries and pigments.

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    Manganese Dioxide (MnO2)

    A pink or purple solution formed when manganese dissolves in water.

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    Mercury(II) Iodide (HgI2)

    A scarlet-red solid compound used in the production of paints and pigments.

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    Nickel(II) dimethylglyoxime (Ni(DMG))

    A reddish-brown solid compound, commonly used in analytical chemistry as an indicator for nickel ions.

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    Hydrogen sulfide (H₂S)

    A colorless gas with a pungent odor, often associated with rotten eggs.

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    Chlorine gas (Cl₂)

    A pale yellow-green gas, often used in disinfectants and bleaching agents.

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    Bromine (Br₂)

    A dark brown liquid, used in photography and other chemical processes.

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    Nickel(II) hydroxide (Ni(OH)₂)

    A green precipitate, formed when nickel ions react with hydroxide ions.

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    Lead(II) sulfide (PbS)

    A black precipitate, formed when lead ions react with sulfide ions.

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    Silver chloride (AgCl)

    A white solid, formed when silver ions react with chloride ions in solution.

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    Silver carbonate (Ag₂CO₃)

    A white solid, formed when silver ions react with carbonate ions.

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    Lead(II) Chloride

    A white, crystalline solid formed by the reaction of lead(II) ions with chloride ions. It is insoluble in water, but soluble in hot water and in concentrated hydrochloric acid.

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    Lead(II) Sulfate

    A white, crystalline solid formed by the reaction of lead(II) ions with sulfate ions. It is insoluble in water and in dilute acids.

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    Copper(II) Hydroxide

    A blue solid formed by the reaction of copper(II) ions with hydroxide ions. It is insoluble in water, but soluble in acids.

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    Copper(II) Nitrate

    A blue solid formed by the reaction of copper(II) ions with nitrate ions. It is soluble in water and in acids.

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    Copper(II) Chloride

    A blue solid formed by the reaction of copper(II) ions with chloride ions. It is soluble in water and in acids.

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    Copper(II) Sulfate Pentahydrate

    A blue solid formed by the reaction of copper(II) ions with sulfate ions. It is soluble in water and in acids.

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    Tetraamminecopper(II) Sulfate

    A deep blue solution formed by the reaction of copper(II) ions with ammonia.

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    Iron(III) hexacyanoferrate(II)

    A deep blue precipitate formed by the reaction of iron(III) ions with ferrocyanide ions. It is insoluble in water and in acids.

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    Study Notes

    Yellow Coloured Compounds

    • As₂S₃
    • As₂S₅
    • CdS
    • SnS (artificial gold)
    • FeS₂ (fool's gold)
    • (NH₄)₂S (where x = 2 to 5)
    • PbCrO₄
    • BaCrO₄
    • AgBr (light yellow)
    • AgI (dark yellow)
    • PbI₂
    • PbO (in cold)
    • ZnO (in hot)
    • HgO (yellow ppt.)
    • Na₂O₂ (pale yellow)
    • Ag₃PO₄
    • Ag₃AsO₃
    • Cu(CN)₂
    • K₃[Co(NO₂)] (Fischer's salt)
    • (NH₄)₃PO₄.12MoO₃
    • (NH₄)₃AsO₄.12MoO₃
    • Na₂CrO₄
    • CrO₄²⁻ (yellow in solution)

    Brown Coloured Compounds

    • SnS
    • Bi₂S₃
    • CdO
    • PbO₂
    • Fe(OH)₃ (reddish brown)
    • Fe₂O₃ (reddish brown solid)
    • Cu₂O (reddish brown)
    • Ag₃AsO₄ (reddish brown)
    • SrCrO₄
    • Ο.NH₂HgI
    • Cu₂I₂ + I₃ (brown ppt.)
    • Cu₂[Fe(CN)₆] (chocolate brown)
    • NO₂ (brown gas)
    • [Fe(H₂O)₄(NO)]SO₄ (brown ring)

    Orange Coloured Compounds

    • Sb₂S₃
    • Sb₂S₅
    • K₂O₃
    • Cs₂O₂
    • Cr₂O₃ (orange in aqueous solution)

    Red Coloured Compounds

    • Ag₂CrO₄ (brick red)
    • Hg₂CrO₄ (brick red)
    • HgI₂ (scarlet red)
    • Pb₃O₄ (2PbO + PbO₂)
    • CrO₂Cl₂ (reddish brown)
    • Fe(CH₃COO)₃ (blood red)
    • Fe(SCN)₃ (blood red)
    • AsI₃
    • SbI₃
    • SnI₂
    • CuBr₂
    • [Ni(DMG)₂] (rosy red)

    Pink Coloured Compounds

    • Mn(OH)₂
    • MnS
    • MnO (pink or purple in aqueous solution)
    • Co(CN)₂
    • CoCl₂.6H₂O (pink on melting black, also known as sympathetic ink)

    Gases

    • Colourless odourless gases: CO₂, N₂, O₂
    • Colourless gases with pungent smell: NH₃, H₂S, SO₂
    • Coloured gases: Cl₂ (yellowish green), Br₂ (brown), NO₂ (brown), I₂ (violet fumes)

    Black Coloured Compounds

    • PbS
    • Ag₂S
    • CuS
    • Cu₂S
    • NiS
    • CoS
    • HgS
    • FeS
    • NiO
    • MnO
    • FeO
    • CuO
    • PbO₂
    • MnO₂
    • Mn₂O₃
    • Fe₃O₄
    • Co₃O₄

    White Coloured Compounds

    • AgCl
    • Ag₂CO₃
    • AgNO₂
    • Ag₂SO₄
    • PbCl₂
    • PbBr₂
    • Cu₂I₂
    • PbSO₄
    • SrSO₄
    • BaSO₄
    • Hg₂SO₄
    • BaCO₃
    • SrCO₃
    • CaCO₃
    • MgCO₃
    • Be(OH)₂
    • Mg(OH)₂
    • Ca(OH)₂
    • Al(OH)₃
    • Cd(OH)₂
    • Bi(OH)₃
    • Zn(OH)₂
    • ZnCO₃
    • ZnS
    • ZnO
    • CaC₂O₄
    • Ag₂C₂O₄
    • Ag₂S₂O₃
    • PbS₂O₃
    • Zn₂[Fe(CN)₆]

    Green Coloured Compounds

    • Ni(OH)₂
    • Hg₂I₂
    • Cr₂O₃
    • Cr(OH)₃
    • Cr₂(SO₄)₃
    • CrCl₃
    • FeSO₄.7H₂O
    • FeCl₂
    • FeSO₄(NH₄)₂SO₄.6H₂O
    • Na₂MnO₄
    • K₂MnO₄
    • B(OC₂H₅)₃
    • CoO, ZnO

    Blue Coloured Compounds

    • Cu(OH)₂
    • Cu(NO₃)₂
    • CuCl₂
    • CuSO₄.5H₂O
    • Co(OH)₂

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