下列对于某些离子的检验及结论中一定正确的(    ) A.加入稀

下列对于某些离子的检验及结论中一定正确的   

A.加入稀盐酸产生无色的气体,将气体通入澄清石灰水中,溶液变浑浊,一定有CO

B.加入氯化钡溶液有白色沉淀产生,再加盐酸,沉淀不消失,一定有SO

C.加入氢氧化钠溶液并加热,产生的气体能使湿润的红色石蕊试纸变蓝,一定有NH

D.加入碳酸钠溶液产生白色沉淀,再加盐酸白色沉淀消失,一定有Ba2

答案

C

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