1998 年
化學 · 共 49 題 · 點擊選項即時核對答案
Consider the following experiment.
Which of the following statements concerning the above experiment is correct ?
In which of the following reactions does the underlined substance act as a reducing agent ?
Which of the following is NOT the appropriate substance for preparing zinc sulphate by directly mixing with dilute sulphuric acid ?
Consider the following manufacturing process:
Which of the following graphs (not drawn to scale) can represent the change in relative molecular masses of the substances involved during the manufacturing process ?
Dilute sodium hydroxide solution is added successively to four different solutions. Which of the following combinations is correct ?
| Solution | Observation | |
|---|---|---|
| Ammonium chloride | White | |
| Lead(II) nitrate | Yellow | |
| Potassium dichromate | Orange | |
| Iron(III) sulphate | Brown precipitate |
Some physical properties of a compound X are listed below : melting point : 82 °C boiling point : 221 °C solubility in water : soluble Which of the following is the most appropriate method to obtain X from a solution of X in water ?
Consider the following chemical equation : Zn + pMnO₂ + qNH₄⁺ → Zn²⁺ + xMn₂O₃ + yNH₃ + zH₂O Which of the following combinations is correct ?
| x | y | z | |
|---|---|---|---|
| 1 | 2 | 1 | |
| 1 | 3 | 2 | |
| 2 | 3 | 2 | |
| 2 | 2 | 3 |
7.5 g of calcium carbonate is added to 50.0 cm³ of 2 M hydrochloric acid. What is the volume of carbon dioxide liberated at room temperature and pressure ? (Relative atomic masses : C = 12.0, O = 16.0, Ca = 40.0; molar volume of gas at room temperature and pressure = 24.0 dm³)
X is a compound containing four carbon atoms. It gives negative results with the following tests :
The structural formula of X may be
Which of the following steps is NOT included in the Contact Process for the manufacture of sulphuric acid ?