The set having ions which are coloured and paramagnetic both is :
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- \(\mathrm{Cu^{2+}, Cr^{3+}, Sc^{+}}\)
- \(\mathrm{Cu^{2+}, Zn^{2+}, Mn^{4+}}\)
- \(\mathrm{Sc^{3+}, V^{5+}, Ti^{4+}}\)
- \(\mathrm{Ni^{2+}, Mn^{7+}, Hg^{2+}}\)
The Correct Option is A
Solution and Explanation
Option 2: \(\mathrm{Zn^{2+}}\) is 3d10, colourless and diamagnetic. Option 3: \(\mathrm{Sc^{3+}, V^{5+}, Ti^{4+}}\) are all d0, colourless. Option 4: \(\mathrm{Mn^{7+}}\) (d0) and \(\mathrm{Hg^{2+}}\) (d10) are colourless.
Answer: (1) \(\mathrm{Cu^{2+}, Cr^{3+}, Sc^{+}}\)
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