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Question

Which reaction cannot be used for the preparation of the halogen acid?


A
2KBr+H2SO4(Conc)K2SO4+2HBr
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B
NaCl+H2SO4(Conc)NaHSO4+HCl
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C
NaHSO4+NaCl(Conc)Na2SO4+HCl
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D
CaF2+H2SO4(Conc)CaSO4+2HF
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Solution

The correct option is A $$2KBr+{ H }_{ 2 }{ SO }_{ 4 } (Conc)\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+2HBr$$

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:
$$KBr + H_2SO_4 → K_2SO_4 + HBr$$

Chemistry

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