1990 年
化學 · 共 34 題 · 點擊選項即時核對答案
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31.
If dilute hydrochloric acid gets into a student's eye during an experiment, the first thing the student should do is to
32.
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.
C.The 1st statement is false but the 2nd statement is true.
D.Both statements are false.
| 1st statement | 2nd statement |
|---|---|
| Magnesium chloride solution gives a white precipitate with lead(II) nitrate solution. | Magnesium is higher than lead in the metal reactivity series. |
33.
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.
C.The 1st statement is false but the 2nd statement is true.
D.Both statements are false.
| 1st statement | 2nd statement |
|---|---|
| A solution of dry hydrogen chloride in methylbenzene turns blue litmus paper red. | Gaseous hydrogen chloride contains hydrogen ions. |
34.
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.
C.The 1st statement is false but the 2nd statement is true.
D.Both statements are false.
| 1st statement | 2nd statement |
|---|---|
| Sea water can corrode ships more quickly than fresh water. | Sodium chloride in sea water speeds up the corrosion of iron. |