a. \(H_2 + Cl_2 \xrightarrow[]{t^0} 2HCl \) (khí)
b. \(H_2 + S \xrightarrow[]{t^0} H_2S\) (khí)
c. \(H_2 + Br_2 \xrightarrow[]{t^0} 2HBr\) (khí)
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