Which reaction cannot be used for the pr...

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

A

`2KBr` + `Conc. H_(2)SO_(4)` `rarr` `K_2SO_(4)`

B

`NaCl`+ `Conc. H_(2)SO_(4)` `rarr` `Na_(2)SO_(4)`

C

`NaHSO_(4)`+`NaCl` `rarr` `Na_(2)SO_4`

D

`CaF_(2)`+`H_(2)SO_(4)` `rarr` `CaSO_(4)`

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The correct Answer is:

A

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