Which of the following reactions are used for the preparation of the 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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$C a F_{2} + H_{2} S O_{4} c o n c . ⟶ C a S O_{4} + 2 H F$

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$N a C l + H_{2} S O_{4} c o n c . ⟶ N a H S O_{4} + H C l$

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$2 K I + H_{2} S O_{4} c o n c . ⟶ K_{2} S O_{4} + 2 H I$

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Solution

The correct options are
B
$C a F_{2} + H_{2} S O_{4} c o n c . ⟶ C a S O_{4} + 2 H F$

C
$N a C l + H_{2} S O_{4} c o n c . ⟶ N a H S O_{4} + H C l$

For synthesizing $H C l$ :

$N a C l + H_{2} S O_{4} c o n c . ⟶ N a H S O_{4} + H C l$

And for preparing $H F$ ,

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

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