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Species (atoms, molecules or ions) having atleast one unpaired electron are paramagnetic and the species do not having any unpaired electron are diamagnetic in nature. The magnetic moment of any substance
\( \mathrm{P} \) may be given as \( \sqrt{\mathrm{n}(\mathrm{n}+2)} \) B.M., where B.M. = Bohr Magneton, an unit it express magnetic moment

W and \( n \) is the number of unpaired electrons present. Further, the ions having unpaired electrons are coloured due to \( \mathrm{d}-\mathrm{d} \) transition.
Which of the following ion must be colourless?
(A) \( \mathrm{Na}^{+}(\mathrm{Z}=11) \)
(B) \( \mathrm{Cr}^{3+}(\mathrm{Z}=24) \)
(C) \( \mathrm{V}^{2+}(\mathrm{Z}=23) \)
(D) \( \mathrm{Co}^{2+}(\mathrm{Z}=27) \)
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