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+2 votes
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asked Aug 7, 2017 in Chemistry by HariOm Vaja (2,713 points) ● 4 ● 30 ● 136

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

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+2 votes
answered Aug 7, 2017 by Ranjit (3,065 points) ● 8 ● 30
selected Aug 8, 2017 by HariOm Vaja
 
Best answer

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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