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Question

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

A
2KBr+H2SO4(conc)K2SO4+2HBr
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B
2NaCl+H2SO4(conc)Na2SO4+2HCl
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C
NaHSO4+NaClNa2SO4+HCl
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D
CaF2+H2SO4(conc)CaSO4+2HF
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Solution

The correct option is A 2KBr+H2SO4(conc)K2SO4+2HBr
The option (a) is incorrect because HBr is a stronger reducing agent than HCl, and thus it will get oxidised by H2SO4.

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