2000 年
化學 · 共 34 題 · 點擊選項即時核對答案
Consider the following equation: 3Zn(s) + 2NO₃⁻(aq) + 8H⁺(aq) → 3Zn²⁺(x) + 2NO(y) + 4H₂O(z) Which of the following combinations is correct ?
| x | y | z | |
|---|---|---|---|
| aq | g | aq | |
| aq | g | l | |
| aq | aq | l | |
| l | g | aq |
The melting point and boiling point of substance X are 321°C and 765°C respectively. In its molten state, X conducts electricity without decomposition. X probably has
Some potassium carbonate solution is added to a sample of tap water. The mixture then appears cloudy. Which of the following ions is probably present in the sample ?
Which of the following processes requires a catalyst?
Which of the following processes is endothermic?
Which of the following changes occurs in a catalytic converter installation in a motor car?
Which of the following changes is NOT a redox reaction ?
Which of the following compounds would react with ammonium chloride on heating?
In which of the following substances does nitrogen has the smallest oxidation number ?
Which of the following uses of sulphuric acid is/are correct ?