题目：
下列化学反应的离子方程式正确的是
A．向Ba(OH)2溶液中滴加NH4HSO4。溶液至刚好沉淀完全：
Ba2＋＋2OH－＋NH4＋＋H＋＋SO42－＝BaSO4↓＋NH3·H2O＋H2O
B．苯酚钠溶液通入二氧化碳气体：2C6H5O－＋CO2＋H2O＝2C6H5OH十CO32－
C．将少量SO2气体通入足量的NaClO溶液中：SO2＋2ClO－＋H2O＝SO32－＋2HClO
D．稀硝酸中加入过量的铁屑：3Fe＋8H＋＋2NO3－＝3Fe3＋＋2NO↑＋4H2O
答案：
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