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Question
In the following reaction, identify X:
\[\ce{Cr2O^{2-}7 + X ->[H+] Cr^{3+} + H2O + Oxidized product of X}\]
Options
\[\ce{CrO^{2-}4}\]
\[\ce{SO^{2-}4}\]
\[\ce{S^{2-}}\]
\[\ce{Fe^{2+}}\]
MCQ
Solution
\[\ce{Fe^{2+}}\]
Explanation:
\[\ce{Cr2O^{2-}7 + X ->[H+] Cr^{3+} + H2O + Oxidized product of X}\]
\[\ce{CrO^{2-}7 + Fe^{2+} ->[H+] Cr^{3+} + H2O + Fe^{3+}}\]
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