When acidified KMnO 4 is reduced to Mn 2+ , the number of electrons gained per MnO 4 - ion is:

🧪 Chemistry · d- and f-Block Elements · NEET & JEE

When acidified KMnO4 is reduced to Mn2+, the number of electrons gained per MnO4- ion is:

Answer: 5.

Correct answer: A. 5

Explanation: Mn goes from +7 in MnO4- to +2 in Mn2+, a gain of 5 electrons. Hence its equivalent mass in acid medium is molar mass/5.

Aqueous solutions of transition metal ions show characteristic colours caused by electrons absorbing visible light to jump between split d-orbitals; the exact colour depends on the metal, its oxidation state, and surrounding ligands.

Concept context

Transition metals (d-block) and lanthanides/actinides (f-block). Known for coloured compounds, variable oxidation states, complex formation, and catalytic properties. Frequently tested in JEE and NEET.

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When acidified KMnO<sub>4</sub> is reduced to Mn<sup>2+</sup>, the number of electrons gained per MnO<sub>4</sub><sup>-</sup> ion is:

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