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Question

When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

Options

A.zero to +1 and zero to -5
B. zero to -1 and zero to +5
C.zero to -1 and zero to +3
D.zero to +1 and zero to -3

Solution

When chlorine gas reacts with hot and concentrated NaOH solution, it disproportionates into chloride (Cl- ) and chlorate (Cl3-) ions.

In this process, oxidation number of chorine changes from 0 to -1 and 0 to +5.
Note: In disproportionation reactions, the same element undergoes oxidation as well as reduction

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