比较、排序型选择题是化学试题中一种较为常见的题型。要求考生按题意进行排序或比较大小。本文笔者对解答此类选择题时常用方法加以归纳,希望能抛砖引玉。一、挖掘决定因素,分清主次例1有五瓶溶液分别是①10 mL 0.60 mol/L NaOH溶液;②20 mL 0.50 mol/L硫酸溶液;③30mL 0.40 mol/L HCl溶液;④40 mL 0.30 mol/L HAc水溶液;⑤50 mL 0.20 mol/L蔗糖水溶液。以上各瓶溶液所含离子、分子总数的大小顺序是 Comparison and sorting multiple-choice questions are one of the more common questions in chemical test questions. Candidates are asked to sort or compare the size of the questions. In this article, the author summarizes common methods for answering such multiple-choice questions. First, to determine the determinants, to distinguish between the main and sub-cases. There are five bottles of solution are 110 mL 0.60 mol / L NaOH solution; 220 mL 0.50 mol / L sulfuric acid solution; 330mL 0.40 mol / L HCl solution; 440 mL 0.30 mol / L HAc Aqueous solution; 550 mL 0.20 mol/L aqueous sucrose solution. The order of the total number of ions and molecules contained in the above bottle solutions is