1996 年
化學 · 共 50 題 · 點擊選項即時核對答案
Which of the following statements concerning chlorine is INCORRECT ?
Which of the following statements concerning the manufacture of ethanol by fermentation is INCORRECT ?
For Questions 23 and 24, refer to the following experiment. A reaction mixture containing acidified potassium dichromate solution and ethanol is heated using the set-up shown below.
In this experiment, the reaction mixture is undergoing
For Questions 23 and 24, refer to the following experiment. A reaction mixture containing acidified potassium dichromate solution and ethanol is heated using the set-up shown below.
Which of the following statements concerning this experiment is correct ?
N₂ —(step 1)→ NH₃ —(step 2)→ NO —(step 3)→ NO₂ —(step 4)→ HNO₃ Which step in the above flow chart involves the largest change in oxidation number of nitrogen ?
Which of the following pairs is WRONGLY matched ?
| Food | Preservative | |
|---|---|---|
| sausage | monosodium glutamate | |
| meat | sodium nitrite | |
| fruit juice | benzoic acid | |
| pickled papaya | vinegar |
Which of the following statements concerning the above set-up is correct ?
For Questions 28 and 29, refer to the following experiment used to study the causes of hardness of water. A student added some soap solution to four test tubes containing the same volume of different aqueous solutions of the same molarity. He shook the tubes and measured the minimum volume of soap solution needed to form a permanent lather. The results are tabulated below :
| Aqueous solution | Minimum volume of soap solution needed to form a permanent lather / cm³ |
|---|---|
| sodium chloride | 0.6 |
| calcium chloride | 9.3 |
| potassium chloride | 0.9 |
| magnesium chloride | 8.5 |
Which of the following apparatus would be most suitable for measuring the volume of soap solution ?
For Questions 28 and 29, refer to the following experiment used to study the causes of hardness of water. A student added some soap solution to four test tubes containing the same volume of different aqueous solutions of the same molarity. He shook the tubes and measured the minimum volume of soap solution needed to form a permanent lather. The results are tabulated below :
| Aqueous solution | Minimum volume of soap solution needed to form a permanent lather / cm³ |
|---|---|
| sodium chloride | 0.6 |
| calcium chloride | 9.3 |
| potassium chloride | 0.9 |
| magnesium chloride | 8.5 |
Which of the following substances is / are responsible for the hardness of water ?
For Questions 30 and 31, refer to the following experiment.
Which of the following combinations is correct ?
| Gas X | Gas Y | |
|---|---|---|
| chlorine | hydrogen | |
| chlorine | oxygen | |
| hydrogen | chlorine | |
| oxygen | hydrogen |