3 - Quais são as fórmulas das bases formadas pelos respectivos cátions Au+3, Fe2+, Pb2+, Na+ e Mn4+ e OH-
A ) Au(OH)3, Fe(OH)2, Pb(OH)2, NaOH, Mn(OH)4.
B ) Au3OH, Fe2CH, Pb2OH, NaOH, Mn4OH,
C ) Au2(OH)3, Fe(OH)2, Pb(OH)2, NaOH, Mn(OH)4.
D ) Au(OH)3, Fe(OH)2, Pb(OH)2, Na(OH)2, Mn(OH)4.