Mg+H2--->MgH2
2 H2+O2--->2 H2O
2 K+H2--->2 KH
C+2 H2--->CH4
2 P+3 H2--->2 PH3
H2+Br2--->2 HBr
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Verified answer
Mg+H2--->MgH2
2 H2+O2--->2 H2O
2 K+H2--->2 KH
C+2 H2--->CH4
2 P+3 H2--->2 PH3
H2+Br2--->2 HBr