2005 年
化學 · 共 46 題 · 點擊選項即時核對答案
Which of the following health hazards are related to excessive drinking of spirits ?
Which of the following processes involve chemical changes ?
An aqueous solution of a compound reacts with dilute hydrochloric acid to give a gas. This aqueous solution does not give a precipitate with sodium hydroxide solution. What could the compound be ?
Which of the following properties of sodium chloride is/are evidence(s) to support that ionic bonds are strong ?
Which of the following processes affect the amount of carbon dioxide in the atmosphere?
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
| 1st statement | 2nd statement |
|---|---|
| Citric acid is an electrolyte. | When citric acid is dissolved in water, citric acid molecules becomes mobile. |
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
| 1st statement | 2nd statement |
|---|---|
| Iodine can displace chlorine from potassium chloride solution. | Iodine is a stronger oxidizing agent than chlorine. |
In which of the following combinations will oxygen be produced as the major product at the anode during electrolysis ?
| electrolyte | cathode | anode | |
|---|---|---|---|
| 0.1 M CuCl₂ | platinum | platinum | |
| 0.1 M CuCl₂ | copper | copper | |
| 5 M HCl | platinum | platinum | |
| 5 M HCl | copper | copper |
Which of the following substances is NOT used for the preparation of soaps ?
When a metal X is warmed with an acid Y, they react to form a colourless solution and a brown gas. Which of the following combinations is correct ?
| X | Y | |
|---|---|---|
| zinc | concentrated nitric acid | |
| copper | concentrated sulphuric acid | |
| zinc | concentrated sulphuric acid | |
| copper | concentrated nitric acid |