6) Identifique a alternativa que apresenta somente diácidos:
a) H₂S, H₂SO4, H3PO4, H3PO3.
b) HCN, H₂S, H3PO4, H3PO3.
c) H2S, H2SO4, H2CO3, H3PO3.
d) HCl, H₂S, H2SO4, H3PO3.
e) H2SO4, H2SO3, HNO3, H3PO2.

Me ajudem por favor.​
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