The strongest reducing agent is: (1) \( \mathrm{K} \) (2) \( \mathrm{Ca} \) (3) \( \mathrm{Al} \....

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The strongest reducing agent is:
(1) \( \mathrm{K} \)
(2) \( \mathrm{Ca} \)
(3) \( \mathrm{Al} \)
(4) \( \mathrm{Zn} \)
\( P \)
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