实验室制备下列气体时,所用方法正确的是(   ) A.制氧气时,

实验室制备下列气体时,所用方法正确的是  

A.制氧气时,用Na2O2H2O2作反应物可选择相同的气体发生装置

B.制氯气时,用饱和NaHCO3溶液和浓硫酸净化气体

C.制乙烯时,用排水法或向上排空气法收集气体

D.制二氧化氮时,用水或NaOH溶液吸收尾气

   

答案

【答案】A

 

【考点地位】本题主要是考查常见气体的制备、收集、尾气处理、装置等。

【名师点晴】本题以气体的制备为载体考查了学生对气体制备原理、反应装置的选择、杂质的去除和收集方法的分析和判断,同时考查了学生对实验基础知识、基本仪器的基本技能的掌握。判断常见气体的实验室制备问题,应掌握中学常见气体的发生装置、净化方法、收集方法和尾气处理方法,本题要求学生根据反应原理确定发生装置,根据气体的性质判断除杂方法、收集方法和尾气的处理。

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