A \( S n^{4 +} + 2 e \iff S n^{2} + \)
B \( F e^{2 +} \iff F e^{3 +} - e \)
C \( \frac{1}{2} H_{2} \iff H^{+} + e \)
D \( C a - 2 e \iff C a^{2 +} \)
Correct Answer: Option B
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