a/ H2 + O2 --> H2O
b/ Al + H2SO4 --> Al2( SO4)3 + H2
d/ K + H2O --- > KOH + H2
e/ P + O2 --- > P2O5
g/ Al + HCl --- > AlCl3 + H2
h/ K + H2O --- > KOH + H2
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