Choose correct statement(s) regarding the following reaction. Cr _ 2 O _ 7 ^ 2- ( aq )+3…
Chemistry · JEE Advanced · NTA Exams — d- and f-Block Elements
Choose correct statement(s) regarding the following reaction.
\(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})+3 \mathrm{SO}_{3}^{2-}(\mathrm{aq})+8 \mathrm{H}^{+} \longrightarrow\)
\(2 \mathrm{Cr}^{3+}(\mathrm{aq})+3 \mathrm{SO}_{4}^{2-}(\mathrm{aq})+4 \mathrm{H}_{2} \mathrm{O}\)
\(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})+3 \mathrm{SO}_{3}^{2-}(\mathrm{aq})+8 \mathrm{H}^{+} \longrightarrow\)
\(2 \mathrm{Cr}^{3+}(\mathrm{aq})+3 \mathrm{SO}_{4}^{2-}(\mathrm{aq})+4 \mathrm{H}_{2} \mathrm{O}\)
- \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\) is oxidising agent
- \(\mathrm{SO}_{3}^{2-}\) is reducing agent
- The oxidation number per ‘S’ atom in \(3 \mathrm{SO}_{3}^{2-}\) is increase by two
- The oxidation number per ‘Cr’ atom in \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\) is decreased by three
Answer
(A) Cr _ 2 O _ 7 ^ 2- is oxidising agent, (B) SO _ 3 ^ 2- is reducing agent, (C) The oxidation number per ‘S’ atom in 3 SO _ 3 ^ 2- is increase by two, (D) The oxidation number per ‘Cr’ atom in Cr _ 2 O _ 7 ^ 2- is decreased by three
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