1996 年
化學 · 共 50 題 · 點擊選項即時核對答案
Magnesium and calcium have similar chemical properties because
Which of the following can represent the electronic structure of potassium sulphide ?
The mass number of atom X is 27. X forms a cation with a charge of +3. If the number of neutrons in the cation is 14, what is the number of electrons in the cation ?
Consider the following chemical equation : 2HNO₃(aq) + CaCO₃(x) → Ca(NO₃)₂(y) + H₂O(z) + CO₂(g) Which of the following combinations is correct ?
| x | y | z | |
|---|---|---|---|
| aq | aq | l | |
| aq | aq | aq | |
| s | aq | l | |
| s | s | aq |
Which of the following materials are suitable for making the base and handle of a frying pan ?
| Base | Handle | |
|---|---|---|
| aluminium | polyvinyl chloride | |
| copper | urea-methanal | |
| titanium | polyvinyl chloride | |
| zinc | urea-methanal |
Which of the following substances is used by farmers to increase the pH of soil ?
Which of the following metals would produce the smallest voltage in the above set-up ?
Zinc blocks are often attached to the steel legs of off-shore oil platforms because
Which of the following experiments can be used to show that concentrated sulphuric acid is a dehydrating agent ?
A student added 16 cm³ of 2 M sodium hydroxide solution, in 2 cm³ portions, to 10 cm³ of 2 M nitric acid. He measured the temperature of the mixture immediately after each addition of the sodium hydroxide solution. Which of the following graphs represents the relationship between the temperature of the mixture and the volume of sodium hydroxide solution added ?
