In the experiment, if a substance turns blue litmus paper red, it means the substance is ___. A. acidic B. basic C. neutral D. unknown 相关知识点: 试题来源: 解析 A。解析:在实验中,如果一种物质使蓝色石蕊试纸变红,这意味着该物质是酸性的。B 选项碱性物质会使红色石蕊试纸变蓝;C 选项中性...
An aqueous solution of a gas (X) turns red litmus blue. When added in excess to copper sulphate solution, deep blue colour is obtained. On addition to a ferric .chloride solution a brown precipitate soluble in dilute nitric acid is obtained. Hence, (X) is A SO2(g) B H2S(g) C NO2...
The substance that turns litmus paper red is___. A. an acid B. a base C. water D. salt 相关知识点: 试题来源: 解析 A。能使石蕊试纸变红的是酸。选项 B 碱使石蕊试纸变蓝;选项 C 水一般不会使石蕊试纸变色;选项 D 盐通常也不会使石蕊试纸变红。反馈...
1. A substance with a pH of 9 is considered {Blank}. \\ 2. If red litmus paper is used to test the substance it would turn what color? \\ a. basic; red b. acidic; red c. acidic; blue d. basic; blue What is the color of phenolphthalein in an acidic solution?
烟台2024年04版小学六年级上册英语第四单元 期末试卷(含答案)考试时间：90分钟（总分:120）A卷 考试人：___题号一二三四五总分 得分 一、综合题(共计100题共100分)1. 听力题：A solution can become saturated when it contains a solid that will not ___.2. 选择题：What do we call a building wher...
The substance that turns litmus paper red is ___. A. acid B. base C. neutral solution D. salt solution 相关知识点: 试题来源: 解析 A。能使石蕊试纸变红的物质是酸。选项 B 是碱;选项 C 是中性溶液;选项 D 是盐溶液。只有酸能使石蕊变红。反馈...
“PEP”24年小学六年级英语第五单元真题试卷[有答案]考试时间：80分钟（总分:110）A卷 考试人：___题号一二三四五总分 得分 一、综合题(共计100题)1、填空题：The ___ (猴子) eats bananas and berries.2、听力题：The chemical symbol for gold is ___.3、选择题：What is the capital of Iceland?A...
A. acid B. base C. salt D. water 相关知识点: 试题来源: 解析 B。原因:“For example, litmus paper can turn from red to blue in the presence of a base and from blue to red in the presence of an acid.”。 反馈 收藏
17 A sample of X is heated with aqueous sodium hydroxide and small pieces of aluminium. A gas is produced which turns red litmus paper blue.Aqueous sodium hydroxide solution is added to a second sample of X. A pale green precipitate is observed.What is X? C A ammonium nitrate B chromium...
安庆2024年05版小学5年级上册英语第五单元综 合卷[有答案]考试时间：100分钟（总分:140）A卷 考试人：___题号一二三四五总分 得分 一、综合题(共计100题)1、填空题：The ___ (植物的栖息地) is crucial for their survival.2、听力题：My favorite sport is ___.3、听力题：Astronomers can determine...