2009 年
化學 · 共 50 題 · 點擊選項即時核對答案
Which of the following statements concerning ammonium iodide is correct ?
Which of the following chemicals can best be used to remove the oil dirt inside the drainage pipe in kitchen ?
An oxide of metal M reacts completely with carbon to give 12.6 g of metal M and 2.38 dm³ of carbon dioxide measured at room temperature and pressure. What is the chemical formula of the oxide ? (Relative atomic masses : M = 63.5, O = 16.0; Molar volume of gas at room temperature and pressure = 24 dm³)
Which of the following would NOT occur when a zinc-carbon cell is supplying electricity ?
Questions 35 and 36 refer to the following information. The table below shows how solutions X and Y are respectively made from two monobasic acids A and B.
| solution X | solution Y |
|---|---|
| 40 cm³ of 0.2 M acid A + 10 cm³ of distilled water | 20 cm³ of 0.4 M acid B + 30 cm³ of distilled water |
What is the concentration of acid A in solution X ?
Questions 35 and 36 refer to the following information. The table below shows how solutions X and Y are respectively made from two monobasic acids A and B.
| solution X | solution Y |
|---|---|
| 40 cm³ of 0.2 M acid A + 10 cm³ of distilled water | 20 cm³ of 0.4 M acid B + 30 cm³ of distilled water |
Two identical zinc strips are added to solutions X and Y. The diagrams below show how gas bubbles are given out when the zinc strips are just added to the solutions.
Which of the following deductions is correct ?
Comparing the same volume of 0.5 M NaOH(aq) and 0.5 M NH₃(aq), which of the following is NOT correct ?
| 0.5 M NaOH(aq) | 0.5 M NH₃(aq) | |
|---|---|---|
| higher pH | lower pH | |
| higher electrical conductivity | lower electrical conductivity | |
| forms precipitate with FeSO₄ solution | does not form precipitate with FeSO₄ solution | |
| larger temperature rise when completely neutralised by 1 M HCl | smaller temperature rise when completely neutralised by 1 M HCl |
In an experiment of electroplating nickel on a copper object, which of the following combinations is correct ?
| Anode | Cathode | Electrolyte | |
|---|---|---|---|
| copper object | nickel | CuSO₄(aq) | |
| copper object | nickel | NiSO₄(aq) | |
| nickel | copper object | CuSO₄(aq) | |
| nickel | copper object | NiSO₄(aq) |
Which of the following processes would NOT give an obvious colour change ?
Assuming that air contains 20% of oxygen by volume, how much air is required to burn completely 100 cm³ of ethane ? (All volumes are measured at the same temperature and pressure.)