有關(guān)溶液的下列說法正確的是                                           (    )

   A.溶液一定是無色的               B.溶劑一定是水

   C.濃溶液一定是飽和溶液            D.溶液一定是混合物

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H7N9型禽流感是由H7N9亞型禽流感病毒引起的急性呼吸道傳染病,可用ClO2進行環(huán)境消毒。制取ClO2的微觀過程如圖所示:

                    

 


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              a               b                c               d

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某化學興趣小組同學用Na2CO3溶液和濃HCl來研究簡易滅火器的反應(yīng)原理時,對廢液的成分進行探究。

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實驗步驟

現(xiàn)象

結(jié)論

該廢液中一定沒有鹽酸                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

該廢液中一定含有Na2CO3

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選項

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