ICSE X- Chem. Ion - Colors

Which of the following anions is NOT colorless?

• Bromide (Br⁻)

• Carbonate (CO₃²⁻)

• Chromate (CrO₄²⁻)

• Chloride (Cl⁻)

What color is a solution containing dichromate ions (Cr₂O₇²⁻)?

• Yellow

• Orange

• Green

• Blue

Which cation imparts a blue or green color to a solution?

• Iron(II) (Fe²⁺)

• Copper(II) (Cu²⁺)

• Nickel(II) (Ni²⁺)

• Manganese(II) (Mn²⁺)

Iron(III) ions (Fe³⁺) typically appear in solution as which color?

• Pale green

• Yellow or brown

• Blue

• Pink

Which of these ions is colorless?

• Chromate (CrO₄²⁻)

• Cobalt(II) (Co²⁺)

• Potassium (K⁺)

• Chromium(III) (Cr³⁺)

A solution appears pink. Which cation is most likely responsible for this color?

• Copper(II) (Cu²⁺)

• Iron(II) (Fe²⁺)

• Cobalt(II) (Co²⁺)

• Nickel(II) (Ni²⁺)

Which of the following pairs includes a colorless anion and a colorless cation?

• Chromate (CrO4 2-) and Copper(II) (Cu2+)

• Chloride (Cl-) and Sodium (Na+)

• Dichromate (Cr2O7 2-) and Iron(III) (Fe3+)

• Sulfide (S2-) and Chromium(II) (Cr2+)

What color would you expect a solution containing chromium(III) ions (Cr3+) to be?

• Yellow

• Orange

• Green or violet

• Blue

Which ion is responsible for a yellow color in a solution?

• Dichromate (Cr2O7 2-)

• Chromate (CrO4 2-)

• Copper(II) (Cu2+)

• Iron(II) (Fe2+)

Which of the following cations does *not* produce a colored solution?

• Silver (Ag+)

• Chromium(II) (Cr2+)

• Copper(II) (Cu2+)

• Nickel(II) (Ni2+)