Marque a alternativa que apresenta apenas substâncias compostas:
a) AH2(g), H2O(v), H3PO4(l)
b) BO3(g) , H2SO4(l) , H2(g)
c) CN2(g), Na(s) e Fe(s)
d) DH2O(v), CO2(g) e H3PO4(l)
e) ECO2(g) , O3(g) e H2SO4(l)
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