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

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here is reaction

3Cl2 + 6NaOH   = NaClO3 + 5NaCl  +  3H2O

​Oxidation number of Cl is 0 in Cl2, -1 in NaCl and +5 in NaClO3. So your Tick mark is correct.

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