Number or range of oxidation states shown by d-block elements

1. A.
   Sc
2. B.
   Ti
3. C.
   Mn
4. D.
   Zn

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1. A.
   Sc
2. B.
   Cu
3. C.
   Ti
4. D.
   Zn

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1. A.
   +5
2. B.
   +6
3. C.
   +7
4. D.
   +8

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

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1. A.
   +4
2. B.
   +5
3. C.
   +4, +5
4. D.
   +2, +3

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1. A.
   Completely filled $4s$ subshell
2. B.
   Completely filled $3d$ subshell
3. C.
   Incomplete $3d$ subshell
4. D.
   Incomplete $4s$ subshell

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1. A.
   $+8$
2. B.
   $+5$
3. C.
   $+6$
4. D.
   $+7$

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1. A.
   $\mathrm{Mn}$
2. B.
   $\mathrm{Fe}$
3. C.
   $\mathrm{Zn}$
4. D.
   $\mathrm{W}$

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