试题与答案

下列实验操作中,错误的是() A.蒸发操作时,不能使混合物中的水分完全蒸干后,才

题型:选择题

题目:

下列实验操作中,错误的是                                  (    )                                       

A.蒸发操作时,不能使混合物中的水分完全蒸干后,才停止加热

B.蒸馏操作时,应使温度计水银球靠近蒸馏烧瓶的支管口处

C.分液操作时,分液漏斗中下层液体从下口放出,上层液体从上口倒出

D.萃取操作时,应选择有机萃取剂,且萃取剂的密度必须比水大

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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