2001 年
化學 · 共 39 題 · 點擊選項即時核對答案
Which of the following pairs is correctly matched?
| Pollutant | Effect | |
|---|---|---|
| carbon monoxide | global warming | |
| sulphur dioxide | darkening of building walls | |
| lead compounds | liver disease | |
| unburnt hydrocarbons | lung cancer |
A mixture consists of one mole of sodium carbonate and one mole of sodium hydrogencarbonate. What is the least number of moles of hydrochloric acid required to liberate all the available carbon dioxide from the mixture?
Which of the following statements is correct for a soapy detergent but incorrect for a soapless detergent ?
Which of the following compounds is a monomer of polyvinyl chloride (polychloroethene)?
Consider the following information about four substances, W, X, Y and Z:
| Substances | Melting point /°C | Electrical conductivity at room temperature |
|---|---|---|
| W | −23 | poor |
| X | 56 | poor |
| Y | 232 | good |
| Z | 750 | poor |
Which substance has a simple molecular structure and is a solid at room temperature ?
Consider the half equations of a redox reaction: 8H⁺(aq) + MnO₄⁻(aq) + 5e⁻ → Mn²⁺(aq) + 4H₂O(l) C₂O₄²⁻(aq) → 2CO₂(g) + 2e⁻ How many moles of MnO₄⁻(aq) ions will react completely with one mole of C₂O₄²⁻(aq) ions ?
The table lists some information about two elements, X and Y:
| Element | Atomic number | Relative atomic mass |
|---|---|---|
| X | 12 | 24.0 |
| Y | 9 | 19.0 |
The compound formed from X and Y has a formula mass of
Which of the following statements concerning ethanol and butan-2-ol is INCORRECT ?
Which of the following equations represents a redox reaction ?
Phosphoric acid is a tribasic acid with formula H₃PO₄. Which of the following formulae is INCORRECT?