Of the ions \( \mathrm{Zn}^{2+}, \mathrm{Ni}^{2+} \) and \( \mathrm...

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Of the ions \( \mathrm{Zn}^{2+}, \mathrm{Ni}^{2+} \) and \( \mathrm{Cr}^{3+} \) [atomic number of \( \mathrm{Zn}=30, \mathrm{Ni}=28, \mathrm{Cr}=24 \) ]
\( \mathrm{P} \)
(1) Only \( \mathrm{Zn}^{2+} \) is colourless and \( \mathrm{Ni}^{2+} \) and \( \mathrm{Cr}^{3+} \) are
WV coloured
(2) All three are colourless
(3) All three are coloured
(4) \( \mathrm{Only} \mathrm{Ni}^{2+} \) is coloured and \( \mathrm{Zn}^{2+} \) and \( \mathrm{Cr}^{3+} \) are colourless
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