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【題目】下列物質能使干燥的藍色石蕊試紙先變紅后褪色的是( )

①氯氣 ②液氯 ③新制的氯水 ④氯氣的酒精溶液

⑤鹽酸 ⑥鹽酸酸化的漂白粉溶液

A．①②③ B．①②③⑥

C．③⑥ D．②③⑥

【答案】C

【解析】能使干燥的藍色石蕊試紙變紅說明溶液顯酸性，而后褪色，說明溶液中有表現(xiàn)漂白性的物質。Cl2溶于水后得到氯水，既表現(xiàn)酸性又表現(xiàn)漂白性。鹽酸酸化的漂白粉溶液既表現(xiàn)酸性又表現(xiàn)漂白性。

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