Which of the following is colourless?
1)Fe^3+
2)Fe^2+
3)Cu^+
4)Cu^2+
Answers
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If the ion is paramagnetic then it is coloured. If it is diamagnetic then it is colourless
We can decide the ions paramagnetic or diamagnetic by writing their electronic configuration and seeing number of unpaired electrons
If number of unpaired electrons = 0 then it is diamagnetic otherwise paramagnetic
Answer is Fe+3, Cu+
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Answer is Fe+3, Cu+
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