Disproportionation occurs when:
AA salt dissolves in water
BThe same element in a single oxidation state simultaneously oxidises and reduces — going to both higher and lower oxidation states. E.g., 3 MnO₄²⁻ + 4H⁺ → 2 MnO₄⁻ + MnO₂ + 2H₂O
CTwo different metals are mixed
DA molecule splits into two identical halves
Answer & Solution
Correct answer: B. The same element in a single oxidation state simultaneously oxidises and reduces — going to both higher and lower oxidation states. E.g., 3 MnO₄²⁻ + 4H⁺ → 2 MnO₄⁻ + MnO₂ + 2H₂O
**Disproportionation**: same element atoms in one oxidation state become BOTH higher AND lower OS. **Mn(VI) → Mn(VII) + Mn(IV)**. Other examples: Cu⁺ → Cu²⁺ + Cu; ClO⁻ → ClO₃⁻ + Cl⁻.
Related questions
Which of the following coordination compounds shows OPTICAL ISOMERISM?The HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation state$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in thiCoordination compounds of transition metals are often COLOURED. CFT explains this colour aWhich of the following best states the CHELATE EFFECT?Cis-trans isomerism is observed in$[\mathrm{Fe(CN)_6}]^{4-}$ has $\mathrm{CN^-}$ ligands, which are STRONG-FIELD ligands. ThIn CRYSTAL FIELD THEORY (CFT) for an OCTAHEDRAL complex, the five degenerate d-orbitals of