下列对实验现象的描述，正确的是 A．铁丝在空气中剧烈燃烧，发出

下列对实验现象的描述，正确的是

A．铁丝在空气中剧烈燃烧，发出耀眼白光，生成黑色固体

B．生锈的铁钉在稀盐酸里浸泡一段时间，铁锈消失，溶液为无色

C．向氢氧化钙溶液中滴入几滴无色酚酞试液，溶液变成蓝色

D．向盐酸中滴入几滴紫色石蕊试液，试液变成红色

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