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+NaCl⟶Na2SO4+HCl
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D
CaF2+H2SO4(conc)⟶CaSO4+2HF
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Solution
The correct option is A2KBr+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.