Which reaction cannot be used for the pr...

Which reaction cannot be used for the preparation of halogen acid

A

`CaF_(2) +H_(2) SO_(4"(conc)") +rarr CaSO_(4) + HF `

B

` NaHSO_(4) + NaCl rarr Na_(2) SO_(4) + HCl`

C

` NaCl + H_(2) SO_("4(conc)") rarr NaHSO_(4) + HCl`

D

`2KBr +H_(2) SO_("4(conc)") rarr K_(2) SO_(4) + 2HBr`

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The correct Answer is:

D

`2KBr + H_(2) SO_(4"(conc)")rarr K_(2) SO_(4) + 2HBr`

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