Which of the following act both as oxidant and reductant? (1) \( \mathrm{H}_{2} \mathrm{~S} \) (...

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Which of the following act both as oxidant and reductant?
(1) \( \mathrm{H}_{2} \mathrm{~S} \)
(2) \( \mathrm{SO}_{3} \)
(3) \( \mathrm{H}_{2} \mathrm{O}_{2} \)
(4) \( \mathrm{F}_{2} \)
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