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

(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

 

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#7 | 17th Group

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group 17 ,preparation and properties

(b) When chlorine gas reacts with hot and concentrated NaOH solution, it disproportionates into chloride (Cl-) and chlorate (ClO3-) ions.

In this process, oxidation number of chlorine 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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