Which of the following acts as a strong reducing agent (atomic numbers Ce = 58 Eu = 63 Gd = 64 Lu =71)

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$C e^{4 +}$

$G d^{3 +}$

$L u^{3 +}$

$E u^{2 +}$

answer is C.

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Detailed Solution

$\begin{array}{l} E u^{+ 2} \to E u^{+ 3} + e^{-} \\ 4 f^{7} 4 f^{6} \end{array}$
$E u^{+ 2}$ acts as a strong reducing agent changing to the common +3 state.

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