In which of the following reactions, there is no change valency ?

{4 K C l O}_{3} \to {3 K C l O}_{4} + K C l

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{S O}_{2} + {2 H}_{2} S \to {2 H}_{2} O + 3 S

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{B a O}_{2} + H_{2} {S O}_{4} \to {B a S O}_{4} + H_{2} O_{2}

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2 B a O + O_{2} \to {2 B a O}_{2}

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Solution

The correct option is B ${B a O}_{2} + H_{2} {S O}_{4} \to {B a S O}_{4} + H_{2} O_{2}$
Reaction shown in option (C) is not a redox reaction its is a double displacement reaction and hence no change in valency.

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