Q.

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

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a

Zero to + 1  and  Zero to -5 

b

Zero to + 1  and  Zero to -3

c

Zero to -1  and  Zero to +3 

d

Zero to -1  and   Zero to +5

answer is B.

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Detailed Solution

Cl02 +NaOH(hot,con)    NaCl-1      +NaC+5lO3 

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