Which of the following acts as a strong reducing agent? (Atomic number: $\mathrm{Ce}=58, \mathrm{Eu}=63, \mathrm{Gd}=64, \mathrm{Lu}=71$)

Question

$\mathrm{Eu}^{2+}$

$\mathrm{Gd}^{3+}$

$\mathrm{Lu}^{3+}$

$\mathrm{Ce}^{4+}$

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