2010 年
化學 · 共 50 題 · 點擊選項即時核對答案
In which of the following species does the underlined element have an oxidation number of +3 ?
The structure of compound R is shown below :
The systematic name of R is
Which of the following combinations shows a correct matching of a molecule and its structural formula ?
| molecule | structural formula | |
|---|---|---|
| nitrogen | N=N | |
| helium | He–He | |
| carbon dioxide | O–C–O | |
| hydrogen peroxide | H–O–O–H |
What mass of methane upon complete combustion gives 0.90 g of water ? (Relative atomic masses : H = 1.0, C = 12.0, O = 16.0)
Which of the following statements concerning the manufacture of sulphuric acid by the Contact Process is correct ?
A boiling tube contains hot saturated copper(II) sulphate solution. Large crystals of the salt can be obtained by
Which of the substances listed in the following table has a giant ionic structure ?
| Substance | Electrical conductivity in solid state | Electrical conductivity in molten state |
|---|---|---|
| W | not conducting | not conducting |
| X | not conducting | conducting |
| Y | conducting | not conducting |
| Z | conducting | conducting |
The structures of compounds P and Q are shown below :
Which of the following statements is correct ?
Besides pipette, which of the following apparatus must be used in order to prepare 250.0 cm³ of 0.100 M Na₂CO₃(aq) from 1.00 M Na₂CO₃(aq) ?
A mixture of (NH₄)₂SO₄(aq) and MgSO₄(aq) is heated with excess NaOH(aq). Which of the following observations is correct ?