Which reaction can't be used for the preparation of the given halogen acid?

2 K B r + H_{2} S O_{4} (c o n c) ⟶ K_{2} S O_{4} + 2 H B r

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2 N a C l + H_{2} S O_{4} (c o n c) ⟶ N a_{2} S O_{4} + 2 H C l

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N a H S O_{4} + N a C l ⟶ N a_{2} S O_{4} + H C l

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C a F_{2} + H_{2} S O_{4} (c o n c) ⟶ C a S O_{4} + 2 H F

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Solution

The correct option is A $2 K B r + H_{2} S O_{4} (c o n c) ⟶ K_{2} S O_{4} + 2 H B r$
The option (a) is incorrect because $H B r$ is a stronger reducing agent than $H C l$ , and thus it will get oxidised by $H_{2} S O_{4}$ .

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