下列说法或表达式正确的是(    ) A.CaCO3的电离方程式:CaCO3Ca2+

下列说法或表达式正确的是(    )

A.CaCO3的电离方程式:CaCO3Ca2++CO32-

B.物质的量浓度相同,体积也相同的一元酸和一元碱恰好中和时溶液一定呈中性

C.工业上合成氨采用循环操作是为了提高N2和H2的利用率

       D.硫酸氢钠滴加到过量的碳酸钠溶液中:CO32- + 2HSO4-=CO2 ↑+ 2SO42-+ H2O

答案

C


解析:

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