Compare 3d ions by unpaired electrons or magnetic moment (highest, lowest, zero, equal pair)

1. A.
   Fe
2. B.
   Cr
3. C.
   Mn
4. D.
   Ni

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1. A.
   Mn
2. B.
   Co
3. C.
   Fe
4. D.
   Zn

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

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

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1. A.
   $V^{3 +}$
2. B.
   ${Cr}^{3 +}$
3. C.
   ${Mn}^{2 +}$
4. D.
   ${Fe}^{2 +}$

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

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

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

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

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1. A.
   (B) and (D) only
2. B.
   (A) and (E) only
3. C.
   (C) and (D) only
4. D.
   (A) and (D) only

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

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1. A.
   $\mathrm{Fe^{2+}}$ and $\mathrm{Mn^{2+}}$
2. B.
   $\mathrm{Co^{2+}}$ and $\mathrm{Ni^{2+}}$
3. C.
   $\mathrm{Fe^{2+}}$ and $\mathrm{Cr^{2+}}$
4. D.
   $\mathrm{Co^{2+}}$ and $\mathrm{Fe^{2+}}$

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

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