Chemistry - Salt Analysis Question with Solution | TestHub

ChemistrySalt AnalysisANION miscellaneous/mixedMedium2 minQB

ChemistryMediummultiple choice

Which anion is oxidised by $MnO_{4}^{-} / H^{+}$ and reduced by $Zn + NaOH$ (Aq.)

Options:(select one or more)

Answer:

C, D

Solution:

The anion must be oxidized by acidic KMnO₄ and also reduced by Zn + NaOH, meaning it should be in an intermediate oxidation state.

NO₂⁻ (N = +3) can be oxidized to NO₃⁻ (+5) and reduced to NH₃ or other lower oxidation state products. SO₃²⁻ (S = +4) can be oxidized to SO₄²⁻ (+6) and reduced to S²⁻ or lower oxidation states.

NO₃⁻ (+5) is already at maximum oxidation state, while S²⁻ (−2) is at minimum oxidation state.

Stream:JEESubject:ChemistryTopic:Salt AnalysisSubtopic:ANION miscellaneous/mixed

⏱ 2mℹ️ Source: QB

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