• # question_answer 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) $Ca{{F}_{2}}+{{H}_{2}}S{{O}_{4}}\to CaS{{O}_{4}}+2HF$

$2KBr+{{H}_{2}}S{{O}_{4}}\,\to \,{{K}_{2}}S{{O}_{4}}+2HBr$