Question

When $C{l}_2$ gas reacts with hot and concentrated sodium hydroxide, the oxidation number of chlorine changes from:


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Answer 1

The oxidation state of chlorine atoms in chlorine molecules is zero.
When chlorine gas is reacted with hot and concentrated sodium hydroxide solution to give the product of sodium chloride and sodium chlorate.

$6NaOH\left(aq\right)+3\underset{0}{C{l}_2}\left(g\right)\to 5Na\underset{-1}{Cl}\left(aq\right)+Na\underset{+5}{C}l{O}_3\left(aq\right)+3H_{2}O\left(l\right)$

Hence, option (b) is correct.