Which of the following compounds have colour due to d-d transition?
A. KMnO4
B. K2Cr2O7
C. K2CrO4
D. CuSO4.5H2O
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Which of the following compounds have colour due to d-d transition?
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Which of the following compounds have colour due to d-d transition?
A. KMnO4
B. K2Cr2O7
C. K2CrO4
D. CuSO4.5H2O
Compounds that exhibit color due to d-d transitions typically contain transition metal ions with partially filled d orbitals.
A. KMnO4: Potassium permanganate (KMnO4) is a strong oxidizing agent and does not exhibit color due to d-d transitions. Its color is due to charge transfer transitions.
B. K2Cr2O7: Potassium dichromate (K2Cr2O7) is orange-red in color due to d-d transitions in the chromium (Cr) ions. The Cr(VI) ions in the compound have partially filled d orbitals, which absorb light in the visible region, resulting in the observed color.
C. K2CrO4: Potassium chromate (K2CrO4) is yellow in color due to charge transfer transitions. It does not exhibit d-d transitions.
D. CuSO4.5H2O: Copper(II) sulfate pentahydrate (CuSO4.5H2O) is blue in color due to d-d transitions in the copper (Cu) ions. The Cu(II) ions in the compound have partially filled d orbitals, which absorb light in the visible region, resulting in the observed blue color.
Therefore, the compounds that have color due to d-d transitions are options (B) K2Cr2O7 and (D) CuSO4.5H2O.