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Question
Which of the following compounds is not coloured?
Options
Na2[CuCl4]
Na3[AlF6]
K4[Fe(CN)6]
K3[Fe(CN)6]
MCQ
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Solution
Na3[AlF6]
Explanation:
- Na2[CuCl4]: Contains Cu2+, which has unpaired d-electrons, making the compound coloured.
- K3[Fe(CN)6]: Contains Fe2+, which has unpaired d-electrons, giving it colour.
- K4[Fe(CN)6]: Contains Fe3+, which also has unpaired d-electrons, making it coloured.
- Na3[AlF6]: Contains Al3+, which has no d-electrons, and F− is a weak ligand, so the compound is colourless.
Thus, Na3[AlF6] is not coloured.
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