1990 年
化學 · 共 34 題 · 點擊選項即時核對答案
What volume of 0.5 M sulphuric acid is required to liberate 4.8 dm³ of carbon dioxide at room temperature and pressure from excess solid hydrogencarbonate? (Molar volume of gas at room temperature and pressure = 24 dm³)
150.0 cm³ of 3.0 M sodium hydroxide solution is mixed with 50.0 cm³ of 1.0M sodium hydroxide solution. The concentration of the resultant solution is
A pupil, working with dilute acids in the laboratory, carelessly poured the unused acids into the sink. Later it was found that the copper pipe in the sink had begun to leak. Which of the following acids is/are most likely to have caused the damage ?
Which of the following statements concerning 25 cm³ of 1M hydrochloric acid and 25 cm³ of 1M ethanoic acid is/are correct?
Sulphuric acid is NOT used to prepare carbon dioxide from limestone because
Which of the following statements concerning acid rain is NOT correct?
In which of the following pairs of substances is the oxidation number of the sulphur atom and the nitrogen atom the same ?
Which of the following pairs of substances would react to produce hydrogen?
X is a white solid. When dilute hydrochloric acid is added to X, a colourless gas is liberated. An aqueous solution of X gives a white precipitate with silver nitrate solution. X is probably
A student tries to plate a copper ring with nickel using the set-up below:
Which of the following combination is correct ?
| Anode | Cathode | Electrolyte | |
|---|---|---|---|
| copper ring | nickel rod | Ni²⁺(aq) | |
| nickel rod | copper ring | Ni²⁺(aq) | |
| copper ring | nickel rod | Cu²⁺(aq) | |
| nickel rod | copper ring | Cu²⁺(aq) |