Assinale a alternativa onde só estão representados os sais:
a. NaOH; LiOH; Fe(OH)2; KOH;
b. KBr; ZnO; Cl2O7; HNO2
c. H2SO3; NaClO; BaOH; Fe3O4
d. H2CO3; HBr; HClO2; H2SO4
e. NaI; HI; CaCO3; NaHCO3
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