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) \[Ca{{F}_{2}}+{{H}_{2}}S{{O}_{4}}\to CaS{{O}_{4}}+2HF\]
Correct Answer: A
Solution :
\[2KBr+{{H}_{2}}S{{O}_{4}}\,\to \,{{K}_{2}}S{{O}_{4}}+2HBr\]
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