4AB › Chemistry PYQ › CSIR-NET › June 2015 › Q37Q37 · CSIR-NET Chemistry, June 2015 Paper: CSIR-NET June 2015 · Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acids & Bases – General · Marks: 2 · Difficulty: Medium
Match the action of $\mathrm{H}_{2} \mathrm{O}_{2}$, in aqueous medium given in column A with the oxidation/reduction listed in column B A: action of $\mathrm{H_2O_2}$ B: type of reaction (1) Oxidation in acid (A) $[\mathrm{Fe(CN)_6}]^{3-} \rightarrow [\mathrm{Fe(CN)_6}]^{4-}$ (II) Oxidation in base (B) $[\mathrm{Fe(CN)_6}]^{4-} \rightarrow [\mathrm{Fe(CN)_6}]^{3-}$ (III) Reduction in acid (C) $\mathrm{MnO_4^{-}} \rightarrow \mathrm{Mn^{2+}}$ (IV) Reduction in base (D) $\mathrm{Mn^{2+}} \rightarrow \mathrm{Mn^{4+}}$
(a) $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \rightarrow\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}$ (II) Oxidation in base
(b) $[\mathrm{Fe}(\mathrm{CN}) 6] 4-\rightarrow\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3-}$ (III) Reduction in acid
(c) $\mathrm{MnO}^{4-} \rightarrow \mathrm{Mn}^{2+}$ (IV) Reduction in base
(d) $\mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^{4+}$
Answer Answer: B ✓ checked by 4AB · confidence high
Explanation H₂O₂ oxidises [Fe(CN)₆]⁴⁻ to [Fe(CN)₆]³⁻ in acid, and Mn²⁺ to MnO₂ (Mn⁴⁺) in base. It reduces MnO₄⁻ to Mn²⁺ in acid, and [Fe(CN)₆]³⁻ to [Fe(CN)₆]⁴⁻ in base. I-B, II-D, III-C, IV-A (b).
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