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JEE Main 2019 · 10 Jan · Shift II

JEE Main 2019 Chemistry question on Redox and Electrochemistry

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2CO_2 is
  1. A.
    2
  2. B.
    5
  3. C.
    1
  4. D.
    10
Show answer and solution

Correct option: C

Solution

In acidic medium, oxalate (C₂O₄²⁻) is oxidized to CO₂. Each carbon in oxalate has oxidation state +3, and in CO₂ it is +4. So each carbon loses 1 electron. Since one molecule of CO₂ comes from one carbon atom, exactly 1 electron is transferred per CO₂ molecule produced.

[JEE Main 2019 · 10 Jan · Shift II]

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