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【单选题】
对于某些离子的检验及结论一定正确的是（　　）
A.
某物质进行焰色反应时呈现黄色，则该物质中一定含有Na +
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 4 2-
C.
加入氢氧化钠溶液并加热，产生的气体能使湿润红色石蕊试纸变蓝，一定有NH 4 +
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Ba 2+
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