\( \mathrm{Fe}^{3+} \) is reduced to \( \mathrm{Fe}^{2+} \) by using (A) \( \mathrm{H}_{2} \math...

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\( \mathrm{Fe}^{3+} \) is reduced to \( \mathrm{Fe}^{2+} \) by using
(A) \( \mathrm{H}_{2} \mathrm{O}_{2} \) in presence of \( \mathrm{NaOH} \)
(B) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) in water
(C) \( \mathrm{H}_{2} \mathrm{O}_{2} \) in presence of \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(D) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) in presence of \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
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