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\( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{X} \stackrel{\mathrm{H}^{+}}{\longrightarrow} \mathrm{Cr}^{3+}+\mathrm{H}_{2} \mathrm{O}+ \) Oxidized product
P of \( \mathrm{X} . \mathrm{X} \) in the above reaction cannot be

W
(1) \( \mathrm{C}_{2} \mathrm{O}_{4}^{2-} \)
(2) \( \mathrm{Fe}^{2+} \)
(3) \( \mathrm{SO}_{4}^{2-} \)
(4) \( \mathrm{S}^{2-} \)
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