1995 年

化學 · 共 49 題 · 點擊選項即時核對答案

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41.

Which of the following products may be formed from the cracking of heavy oil fraction?

(1)CO

(2)C₂H₄

(3)C₈H₁₈

42.

Which of the following are characteristics of a homologous series?

(1)Members of the series can be represented by the same general formula.

(2)Members of the series have the same physical properties.

(3)Members of the series have similar chemical properties.

43.

Which of the following substances are released as a result of the burning of tobacco?

(1)tar

(2)nicotine

(3)paracetamol

44.

For Questions 45–50, 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 are true and the second correctly explains the first.

B.Both are true but the second does not correctly explain the first.

C.The first is false but the second is true.

D.Both are false.

1st statement	2nd statement
When a piece of iron wire coupled with a piece of tin wire is left in the air for a long period of time, the iron wire does not corrode.	Tin prevents iron from corrosion by sacrificial protection.

45.

For Questions 45–50, 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 are true and the second correctly explains the first.

B.Both are true but the second does not correctly explain the first.

C.The first is false but the second is true.

D.Both are false.

1st statement	2nd statement
The basicity of ethanoic acid is four.	One molecule of ethanoic acid contains four atoms of hydrogen.

46.

For Questions 45–50, 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 are true and the second correctly explains the first.

B.Both are true but the second does not correctly explain the first.

C.The first is false but the second is true.

D.Both are false.

1st statement	2nd statement
Nylon softens on heating.	Nylon is a condensation polymer.

47.

For Questions 45–50, 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 are true and the second correctly explains the first.

B.Both are true but the second does not correctly explain the first.

C.The first is false but the second is true.

D.Both are false.

1st statement	2nd statement
Huge quantities of carbon dioxide produced by the burning of fossil fuels cause the greenhouse effect.	Carbon dioxide can trap the solar energy which is re-radiated from the earth’s surface to the atmosphere.

48.

For Questions 45–50, 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 are true and the second correctly explains the first.

B.Both are true but the second does not correctly explain the first.

C.The first is false but the second is true.

D.Both are false.

1st statement	2nd statement
If a student accidentally spills some hydrochloric acid on his hand, he should immediately wash his hand with sodium hydroxide solution.	Sodium hydroxide solution can neutralise hydrochloric acid.

49.

For Questions 45–50, 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 are true and the second correctly explains the first.

B.Both are true but the second does not correctly explain the first.

C.The first is false but the second is true.

D.Both are false.

1st statement	2nd statement
Panadol is an antacid.	Panadol contains acetylsalicylate as the active ingredient.