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JEE Main levelSingle correct optionDifficulty 2 of 3ev026

In a catalytic converter the reaction $2 CO + 2 NO 2 CO X_{2} + N X_{2}$ occurs. The total number of electrons transferred (from the species oxidised to the species reduced) for the equation as written is

A8
B2
C6
D4

Answer: D

Each C goes from +2 to +4, losing 2 e-, so 2 CO lose 4 e-. Each N goes from +2 to 0, gaining 2 e-, so 2 NO gain 4 e-. Total transfer is 4 electrons.

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