1996 年

化學 · 共 50 題 · 點擊選項即時核對答案

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41.

Which of the following statements concerning propan-1-ol are correct ?

(1)Propan-1-ol can be used as a solvent.

(2)Propan-1-ol can undergo polymerisation.

(3)Propan-1-ol can undergo esterification with ethanoic acid in the presence of concentrated sulphuric acid.

42.

X is an element. It can form a cation X²⁺ which has an electronic arrangement 2, 8, 8. Which of the following statements concerning X are correct ?

(1)X is a strong oxidising agent.

(2)X is in Period 4 of the Periodic Table.

(3)X burns in oxygen with a brick red flame.

43.

Which of the following statements concerning the use of sodium sulphite as a food additive are correct ?

(1)It is toxic to bacteria.

(2)It is an antioxidant.

(3)It is a flavour enhancer.

44.

Which of the following elements can react together to form a covalent compound ?

(1)argon

(2)nitrogen

(3)oxygen

(4)calcium

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 melting point of hydrogen chloride is lower than that of potassium chloride.	Hydrogen chloride is a covalent compound whereas potassium chloride is an ionic compound.

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
Zinc-carbon dry cells are rechargeable.	The electrolyte used in zinc-carbon dry cells is potassium hydroxide.

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
The resistance of aluminium to corrosion can be enhanced by anodisation.	During anodisation, aluminium oxide on the metal surface is reduced to aluminium.

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
The cost of town gas goes up when the cost of crude oil rises.	Town gas is manufactured from naphtha.

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
The volume of hydrogen liberated at room temperature and pressure by the reaction between 10 cm³ of 10 M hydrochloric acid and excess zinc granules is greater than that between 50 cm³ of 2 M hydrochloric acid and excess zinc granules.	10 M hydrochloric acid is a stronger acid than 2 M hydrochloric acid.

50.

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
Both dry ice and quartz exist in the form of discrete molecules.	Carbon and silicon atoms have the same number of electrons in their outermost shells.