Which ion is not coloured (1) \( \mathrm{Cr}^{3 *} \) (2) \( \mathr...

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Which ion is not coloured
(1) \( \mathrm{Cr}^{3 *} \)
(2) \( \mathrm{Co}^{2+} \)
(3) \( \mathrm{Cr}^{2} \)
(4) \( \mathrm{Cu}^{+} \)
\( \mathrm{P} \)
W
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