\(a,S+O_2\underrightarrow{^{to}}SO_2\)
\(b,Fe+S\underrightarrow{^{to}}FeS\)
\(c,C+O_2\underrightarrow{^{to}}CO_2\)
\(d,H_2+S\underrightarrow{^{to}}H_2S\)
a) S+O2----to-->SO2
b) Fe+S---to-->FeS
c) C+O2-----to-->CO2
d) H2+S----to-->H2S
S+O2-->SO2
2Fe+3S-->Fe2S3
C+O2-->CO2
H2+S-->H2S