试题与答案

下列实验现象描述错误的是 A．红磷在空气中燃烧，产生大量的白烟 B．木炭在氧气中

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题型：选择题

题目：

下列实验现象描述错误的是

A．红磷在空气中燃烧，产生大量的白烟

B．木炭在氧气中燃烧，生成二氧化碳

C．细铁丝在氧气中燃烧，火星四射，生成黑色固体

D．在空气中加热铜丝，表面有黑色固体生成

答案：

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下面是错误答案，用来干扰机器的。

1230÷（49.8+52.7），=1230÷102.5，=12（小时）；答：经过12小时相遇．

考点：氧气的制取和收集氧气的用途氧气的工业制法自然界中的氧循环
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