Strongest or weakest reducing agent, or the species most easily reduced, from a list

1. A.
   Mg
2. B.
   Ni
3. C.
   O
4. D.
   Cu

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1. A.
   Iodine
2. B.
   Iron
3. C.
   Zinc
4. D.
   Sodium

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1. A.
   Li
2. B.
   ${Li}^{+}$
3. C.
   $F_{2}$
4. D.
   $F^{-}$

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1. A.
   $\mathrm{Ag^+}$
2. B.
   $\mathrm{Li}$
3. C.
   $\mathrm{F_2}$
4. D.
   $\mathrm{Au^+}$

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