A.Ba(OH)2+2H++SO42\ufe63BaSO4↓+2H2O
B.Ba2++2OH\ufe63+2H++SO42\ufe63BaSO4↓+2H2O
C.Ba2++OH\ufe63+H++SO42\ufe63BaSO4↓+H2O
D.OH\ufe63+H+H2O
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