将一根螺旋状的细铁丝放入硫酸铜溶液中,如下图所示,经过较长一

将一根螺旋状的细铁丝放入硫酸铜溶液中,如下图所示,经过较长一段时间后观察到(  )

A.铁丝表面覆盖了一层紫红色固体物质     B.溶液由蓝色变为无色

C.在试管底部沉积了一层黑色固体物质     D.铁丝表面覆盖了一层银白色固体物质

答案

A

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