木炭粉与浓硝酸共热产生的气体等分为①和②两份,第一份先导入适

木炭粉与浓硝酸共热产生的气体等分为①和②两份,第一份先导入适量蒸馏水,再导入澄清石灰水;第二份直接导入澄清石灰水,则石灰水的变化可能是(    )

A.①不变浑浊,②变浑浊              B.①变浑浊,②不变浑浊

C.①与②都变浑浊                       D.①与②都未见沉淀

答案

解析:木炭和浓硝酸反应产生的是CO2和NO2的混合气体,当气体通入水中时,NO2会和水反应生成硝酸,由于硝酸可以溶解CaCO3,所以直接通入澄清石灰水中时,没有沉淀产生,但是先用水洗除去NO2后,再通入澄清石灰水中时,可以产生沉淀。

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