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The reaction that takes place when \( C l_{2} \) gas is passed through conc. NaOH solution is :

1. oxidation
2. reduction
3. displacement
4. disproportionation

Correct answer: disproportionation

Solution

Chlorine starts at oxidation state 0 in Cl2 and ends up in two different oxidation states in the products: one part is reduced to chloride (−1) and another is oxidized to hypochlorite/chlorate. Since the same species undergoes both oxidation and reduction, the reaction is disproportionation.

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