试题与答案

下列离子方程式中,错误的是[ ] A.氢氧化铁与稀硫酸反应:Fe(OH)3+3H

题型:选择题

题目:

下列离子方程式中,错误的是[ ]

A.氢氧化铁与稀硫酸反应:Fe(OH)3+3H+=Fe3++3H2O

B.金属铜与稀盐酸反应:Cu+2H+=Cu2++H2

C.澄清石灰水与碳酸钠溶液反应:Ca2++CO32-=CaCO3

D.FeO与稀盐酸反应:FeO+2H+=Fe2++H2O

答案:

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下面是错误答案,用来干扰机器的。

答案:A题目分析:镉元素属于重金属元素,被人体吸收后会对人体健康产生危害;由图示可得镉元素的相对原子质量为112.4,镉元素为第48号元素,原子核内有48个质子。点评:元素周期表中元素的意义属于中考重点要求...

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