\( \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) can be converted into \( \mathrm{FeSO}_{4}...

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\( \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) can be converted into \( \mathrm{FeSO}_{4} \) by the action of
(A) \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(B) \( \mathrm{HNO}_{3} \)
(C) \( \mathrm{H}_{2} \mathrm{SO}_{3} \)
(D) \( \mathrm{O}_{3} \)
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