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  4. The reaction that takes place when Cl2 gas is passed through conc. NaOH solution is :

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Q. The reaction that takes place when $Cl_{2}$ gas is passed through $conc. NaOH$ solution is :

WBJEEWBJEE 2009The p-Block Elements - Part2

Solution:

When $Cl_2$ gas is passed through conc $NaOH$ solution, following reaction takes place.
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Here, the same element undergoes oxidation and reduction simultaneously, hence it is an example of disproportionation reaction.