Which reactions are used for the preparation of the halogen acid ?

2 K B r + H_{2} S O_{4} \to K_{2} S O_{4} + 2 H B r

(conc.)

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C a F_{2} + H_{2} S O_{4} \to C a S O_{4} + 2 H F

(conc.)

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N a C l + H_{2} S O_{4} \to N a H S O_{4} + H C l

(conc.)

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2 K I + H_{2} S O_{4} \to K_{2} S O_{4} + 2 H I

(conc.)

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Solution

The correct options are
B $C a F_{2} + H_{2} S O_{4} \to C a S O_{4} + 2 H F$
(conc.)
C $N a C l + H_{2} S O_{4} \to N a H S O_{4} + H C l$
(conc.)
Above reaction produces halogen acid with $H_{2} S O_{4}$ .

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H C l

N a C l

H_{2} S O_{4}

H I

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H_{2} S O_{4}

H_{2} S O_{4}

Why is conc. $H C l$ not used in place of conc. $H_{2} S O_{4}$ in the laboratory preparation of nitric acid?

In lab $H_{2} O_{2}$ is prepared by

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