【单选题】【消耗次数：1】
下列物质属于纯净物的是（ ）。
①
漂白粉
②
液氯
③
盐酸
④
氯水
参考答案：
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下列关于氯水的说法正确的是（ ）。
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氯水久置数天后溶液酸性减弱
②
氯水中只含<img class="kfformula" src="20200628/1593356077315366.png" data-latex="{C1}_{2}" width="56" height="36"/>和<img class="kfformula" src="20200628/1593356077557263.png" data-latex="{H}_{2}O" width="60" height="31"/>分子
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