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化學 · 共 135 題 · 點擊選項即時核對答案

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11.

For Questions 28–30, 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 using a Bunsen burner with the air hole closed, the burner gives a non-luminous flame.	When using a Bunsen burner with the air hole closed, the fuel undergoes incomplete combustion.

12.

For Questions 28–30, 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
Bromine water can react with NaI(aq).	The reducing power of I⁻(aq) ion is stronger than that of Br⁻(aq) ion.

13.

Which of the following experiments would give a colour change ?

(1)Sulphur dioxide is passed into a test tube containing bromine water.

(2)Sulphur dioxide is passed into a gas jar containing moist red flower petals.

(3)Sulphur dioxide is passed into a conical flask containing potassium iodide solution.

14.

For Questions 49–50, 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 using a zinc-carbon cell in electrolysis, the carbon electrode of the cell is connected to the cathode of the electrolytic cell.	In a circuit using zinc-carbon cell to supply electricity, electrons in the external circuit flow to the carbon electrode of the zinc-carbon cell.

15.

For Questions 49–50, 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 reaction of charcoal with oxygen is endothermic.	Charcoal that is placed in fire can be ignited.

16.

This question refers to the following micro-scale experiment.

Which of the following types of reaction is / are involved in the experiment ?

(1)redox reaction

(2)neutralisation

(3)thermal decomposition

17.

Which of the following methods are used to treat solid wastes in Hong Kong ?

(1)recycling of metal wastes

(2)using plastic wastes as fuel

(3)burying domestic solid wastes in landfill sites

18.

For Questions 28–30, 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
Ammonium chloride is an ionic compound.	Ammonium chloride can conduct electricity in aqueous state.

19.

For Questions 28–30, 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
Copper(II) carbonate dissolves in water to give a blue solution.	All solid compounds with copper(II) as the only cations are blue in colour.

20.

For Questions 28–30, 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 sulphur dioxide is added to sodium bromide solution, the mixture obtained is colourless.	Sulphur dioxide can act as a bleaching agent.