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Q.

Hypo is used to remove excess chlorine from fabric in textile industry where chlorine oxidizes hypo to a single product. In this reaction the change in the oxidation state of terminal sulphur of hypo is

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answer is 2.

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Detailed Solution

Na2S2O3+H2O+Cl2⟶Na2SO4+S+HCl
The two sulphur atoms in Na2​S2​O3​ have -2(terminal) and +6(middle) oxidation states.

the change in the oxidation state of terminal sulphur=0-(-2)=2

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