Coloured or colourless 3d ion from its d-electron count

1. A.
   $\text{Zn}^{2+}$
2. B.
   $\text{Fe}^{2+}$
3. C.
   $\text{Cu}^{+}$
4. D.
   $\text{Sc}^{3+}$

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1. A.
   $\text{Fe}^{3+}$
2. B.
   $\text{Fe}^{2+}$
3. C.
   $\text{Cu}^{2+}$
4. D.
   $\text{Cu}^+$

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1. A.
   $\text{Ti}^{3+}$
2. B.
   $\text{V}^{3+}$
3. C.
   $\text{Sc}^{3+}$
4. D.
   $\text{Cu}^{2+}$

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1. A.
   ${Sc}^{3 +}$
2. B.
   ${Ti}^{4 +}$
3. C.
   ${Zn}^{2 +}$
4. D.
   ${Cr}^{3 +}$

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1. A.
   $\mathrm{Sc^{3+}}$
2. B.
   $\mathrm{Ti^{4+}}$
3. C.
   $\mathrm{Cu^+}$
4. D.
   $\mathrm{V^{3+}}$

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1. A.
   Sc
2. B.
   Ni
3. C.
   Cr
4. D.
   V

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1. A.
   it contains 0 unpaired electrons
2. B.
   it contains 1 unpaired electrons
3. C.
   it contains 2 unpaired electrons
4. D.
   it contains 3 unpaired electrons

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1. A.
   $\mathrm{Fe^{3+}}$
2. B.
   $\mathrm{Mn^{2+}}$
3. C.
   $\mathrm{Ti^{4+}}$
4. D.
   $\mathrm{Cu^{2+}}$

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