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回流反应即有机化合物的合成装置中

单选题

2021-09-02 00:02

A、如果温度计水银球位于支管口之下，但若按规定的温度范围集取馏份时，则按此温度计位置集取的馏份比要求的温度偏低，并且将有一定量的该收集的馏份误认为后馏份而损失
B、如果温度计水银球位于支管口之上，蒸气还未达到温度计水银球就已从支管流出，测定沸点时，将使数值偏低。
C、若按规定的温度范围集取馏份，则按此温度计位置集取的馏份比规定的温度偏高，并且将有一定量的该收集的馏份误作为前馏份而损失，使收集量偏少。 D如果温度计的水银球位于支管口之下或液面之上
D、如果温度计的水银球位于支管口之下或液面之上，测定沸点时，数值将偏低。

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正确答案

D

试题解析

标签：联大河南理工大学有机化学实验

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