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b) H2CO3 + Zn(OH)2 -> ZnCO3↓ + 2 H2O, Zn + H2CO3 -> ZnCO3 + H2↑, ZnO + H2CO3 -> ZnCO3↓ + H2O
c) 3 H2SO4 + 2 Al(OH)3 -> Al2(SO4)3 + 6 H2O, 2 Al + 3 H2SO4 -> Al2(SO4)3 + 3 H2↑, Al2O3 + 3 H2SO4 -> Al2(SO4)3 + 3 H2O
d) H2SO4 + 2 CuOH -> Cu2SO4 + 2 H2O, 2 Cu + H2SO4 -> Cu2SO4 + H2↑, Cu2O + H2SO4 -> Cu2SO4 + H2O
e) 2 Fe(OH)3 + 3 H2S -> Fe2S3↓ + 3 H2O, 2 Fe + 3 H2S -> Fe2S3↓ + 3 H2↑, Fe2O3 + 3 H2S -> Fe2S3 + 3 H2O