题目内容：
下列实验现象描述正确的是（ ）
A向硫酸铜溶液中滴加氢氧化钠溶液，有白色沉淀生成
B将二氧化碳通入紫色石蕊溶液中，溶液变蓝
C硫在氧气中燃烧，发出蓝紫色火焰
D打开盛有浓盐酸的试剂瓶的瓶塞，瓶口冒白烟
答案解析：
单选题：下列实验现象描述正确的是（ ） A向硫酸铜溶液中滴加氢氧化钠溶液，有白色沉淀生成B将二氧化碳通入紫色石蕊溶液中，溶液变蓝C硫在氧气中燃烧，发出蓝紫色火焰D打开盛
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