Which reaction cannot be used for the production of halogen acid [MP P

1.	Which reaction cannot be used for the production of halogen acid [MP PMT 1989]
A.	\[2KBr+{{H}_{2}}S{{O}_{4}}\to {{K}_{2}}S{{O}_{4}}+2HBr\]
B.	\[NaHS{{O}_{4}}+NaCl\to N{{a}_{2}}S{{O}_{4}}+HCl\]
C.	\[NaCl+{{H}_{2}}S{{O}_{4}}\to NaHS{{O}_{4}}+HCl\]
D.	\[Ca{{F}_{2}}+{{H}_{2}}S{{O}_{4}}\to CaS{{O}_{4}}+2HF\]
Answer» B. \[NaHS{{O}_{4}}+NaCl\to N{{a}_{2}}S{{O}_{4}}+HCl\]

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Which reaction cannot be used for the production of halogen acid [MP PMT 1989]

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