2005 年
化學 · 共 46 題 · 點擊選項即時核對答案
Directions: Q.10 and Q.11 refer to the following experiment. Rust indicator solution was poured into the following glass dishes to cover the iron nails, which were wrapped with different metal strips. The dishes were allowed to stand in air for some time.
In which of the dishes would the iron nail rust ?
Which of the following reactions is endothermic?
Consider the information given in the table below:
| X | Y | Z | W | |
|---|---|---|---|---|
| No. of protons | 8 | 8 | 8 | 10 |
| No. of electrons | 10 | 10 | 8 | 10 |
| No. of neutrons | 8 | 10 | 10 | 10 |
Which of the following statements about the particles is correct ?
Which of the following compounds has the highest basicity?
ZnS —(Stage 1)→ SO₂ —(Stage 2)→ SO₃ —(Stage 3)→ H₂S₂O₇ —(Stage 4)→ H₂SO₄ Which of the following stages involves the largest change in oxidation number of sulphur ?
The following hazard warning labels are displayed on the reagent bottle of an acid.
What information about this acid can be obtained from the labels?
Which of the following correctly describes the sequence of procedures to separate sand, salt and water from a mixture of sand and salt solution?
Which of the following molecular formulae represents an alkanoic acid?
500 cm³ of calcium hydroxide contains 3.7 g of calcium hydroxide. What is the molarity of the solution? (Relative atomic masses: H = 1.0, O = 16.0, Ca = 40.1)
Which of the following samples of gases contains the smallest number of molecules ? (Relative atomic masses: H = 1.0, C = 12.0, N = 14.0, O = 16.0, S = 32.1)