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Direct Combination

Which reactio...

Question

Which reaction cannot be 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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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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N a H S O_{4} + N a C l (C o n c) ⟶ {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 $2 K B r + H_{2} {S O}_{4} (C o n c) ⟶ K_{2} {S O}_{4} + 2 H B r$
HBr can be synthesized by a variety of methods. It may be prepared in the laboratory by distillation of a solution of sodium bromide or potassium bromide with phosphoric acid or sulfuric acid:
$K B r + H_{2} S O_{4} \to K_{2} S O_{4} + H B r$

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H_{2} {S O}_{4}

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H_{2}

H_{2} {S O}_{4}

H_{2}

H_{2} {S O}_{4}

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