Which of the following does not involve the change of valency?

S O_{2} + 2 H_{2} S \to 2 H_{2} O + 2 S

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2 N a + O_{2} \to N a_{2} O_{2}

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N a_{2} O_{2} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O_{2}

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Z n + C u S O_{4} \to Z n S O_{4} + C u

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Solution

The correct option is A $N a_{2} O_{2} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O_{2}$
The reaction between sodium peroxide and sulphuric acid to obtain sodium sulphate and hydrogen peroxide is a double displacement reaction in which the cations switch positions. Hence, there is no change in valency in this reaction.

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