下列离子方程式书写正确的是
A．Ca（ClO）2溶液中通入过量CO2：Ca2++2C1O-+H2O+CO2CaCO3↓+2HC1O
B．Ba（OH）2溶液中滴入NaHSO4溶液至恰好为中性：
2H++SO42-+Ba2++2OH-BaSO4↓+2H2O
C．金属钠投入水中：2Na+H2O===2Na++OH-+H2↑
D．NaOH溶液中通入C12：2C12+2OH-3C1-+C1O-+H2O
答案：B
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