考试局：Cambridge Assessment International Education (CAIE)
考试类别：International Advanced Level
考试阶段：International Advanced Subsidiary
考试科目：Chemistry
考试单元：Paper 1 Multiple Choice
试卷代码：9701/12
试卷年份：May/June 2019
题目：
Ammonium sulfate, (NH4)2SO4, and ammonium nitrate, NH4NO3, are used as fertilisers.
These salts have different percentages by mass of nitrogen. They have the same effect as each other on the pH of wet neutral soil.
Which row is correct?
题目难度：一般
考点分析：考查nitrogen的相关知识
题目分析：percentage of nitrogen by mass比较容易计算，所以可以把C和D给排除。ammonium nitrate在水中是呈现酸性的，会降低土壤的pH，故而答案选A。
题目：
An excess of chlorine was bubbled into 100 cm3 of hot 6.0 mol dm–3 sodium hydroxide.
How many moles of sodium chloride would be produced in the reaction?
题目难度：一般
考点分析：考查chlorine和sodium hydroxide的反应
题目分析：chlorine和hot sodium hydroxide反应生成sodium chloride和sodium chlorate (V)，产物摩尔比是5比1，sodium hydroxide的摩尔数很容易算出来，然后除以6再乘以5就是答案，选B。
题目：
A white solid, Z, is soluble in water. A sample of Z is heated with a Bunsen burner until there is no further change. When the residue is shaken with water a solution is formed with no solid remaining.
What could Z be?
题目难度：一般
考点分析：考查group 2的carbonate和nitrate相关性质
题目分析：Z is soluble in water，所以把A和C排除了，B加热后剩下的solid是MgO，和水反应非常缓慢，而D加热后剩下的solid是BaO，可以和水反应，生成solution，所以答案选D。