A) \[{{H}_{2}}+{{I}_{2}}\xrightarrow{{}}2HI\]
B) \[{{H}_{2}}S{{O}_{4}}+Ba{{(OH)}_{2}}\xrightarrow{{}}BaS{{O}_{4}}+2{{H}_{2}}O\]
C) \[NaCl+AgN{{O}_{3}}\xrightarrow{{}}NaN{{O}_{3}}+AgCl\]
D) \[Fe+S\xrightarrow{{}}FeS\]
Correct Answer: A
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