下列离子方程式中书写正确的是 A.铁和稀硫酸反应:2Fe+6H+===2Fe3

下列离子方程式中书写正确的是

A.铁和稀硫酸反应:2Fe6H===2Fe33H2

B.碳酸钙和稀盐酸反应:CaCO32H===Ca2CO2H2O

C.铜和硝酸银溶液反应:CuAg===Cu2Ag

D.硫酸镁溶液与氢氧化钡溶液反应:Mg22OH===Mg(OH)2

答案

B

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