Which reaction cannot be used for the production of halogen acid?
- A$2KBr + H_2SO_4 \to K_2SO_4 + 2HBr$
- B$NaHSO_4 + NaCl \to Na_2SO_4 + HCl$
- C$NaCl + H_2SO_4 \to NaHSO_4 + HCl$
- D$CaF_2 + H_2SO_4 \to CaSO_4 + 2HF$
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