2006 年
化學 · 共 43 題 · 點擊選項即時核對答案
The electronic diagram of a compound formed between element X and element Y is shown below:
(Only electrons in the outermost shells are shown.) Which of the following combinations concerning X and Y is correct ?
| X | Y | |
|---|---|---|
| carbon | oxygen | |
| silicon | oxygen | |
| oxygen | sodium | |
| oxygen | chlorine |
Which of the following statements about the Periodic Table is correct ?
What is the oxidation number of cobalt in Co(NH₃)₄Cl₂ ?
Which of the following combinations concerning the change of physical state of a substance is INCORRECT ?
| Change of physical state | Process | |
|---|---|---|
| liquid to gas | evaporation | |
| liquid to solid | precipitation | |
| solid to gas | sublimation | |
| gas to liquid | condensation |
Which of the following substance exist(s) in liquid state at room temperature and pressure ?
| Substance | Melting point /°C | Boiling point /°C |
|---|---|---|
| W | −92 | 7 |
| X | 7 | 81 |
| Y | 56 | 197 |
| Z | −95 | 69 |
Compound X is soluble in water. Addition of sodium hydroxide solution to a solution of X gives a white precipitate. The precipitate does not dissolve upon the addition of excess alkali. X may be
Consider the following equation: x VO₂⁺(aq) + y H⁺(aq) + 2 I⁻(aq) → x VO²⁺(aq) + z H₂O(l) + I₂(aq) (V is the symbol for the element vanadium.) Which of the following combinations is correct ?
| x | y | z | |
|---|---|---|---|
| 1 | 2 | 1 | |
| 1 | 4 | 2 | |
| 2 | 4 | 2 | |
| 3 | 6 | 3 |
Which of the following properties is considered the most important one when choosing an alloy for making fuse in electric plugs ?
Solution X is prepared by mixing 100.0 cm³ of 2.0 M Na₂SO₄(aq) with 50.0 cm³ of 1.0 M NaNO₃(aq). What is the concentration of Na⁺(aq) ions in X?
Which of the following statements about acids is correct?
