2007 年

化學 · 共 49 題 · 點擊選項即時核對答案

只看錯題本頁已答 0 / 10

21.

Questions 20 and 21 refer to the following experiment. When carbon and concentrated sulphuric acid are heated together, sulphur dioxide and carbon dioxide are produced. These two gases are then passed through solution X and solution Y as shown below :

Which of the following statements concerning the reaction between carbon and concentrated sulphuric acid are correct ?

(1)The oxidation number of carbon changes from 0 to +4.

(2)The oxidation number of hydrogen in sulphuric acid remains unchanged.

(3)Concentrated sulphuric acid acts both as a dehydrating agent and an oxidising agent.

22.

Which of the following statements concerning chlorine, bromine and iodine is / are correct ?

(1)They are all coloured substances.

(2)Their reactivity increases with relative atomic mass.

(3)They all react with sodium sulphite solution.

23.

Which of the following statements concerning the compound shown below is / are correct ?

(1)It is neutral to litmus solution.

(2)Its systematic name is propanol.

(3)When it reacts with ethanoic acid, the ester formed is

24.

Consider the redox reaction represented by the equation below :

2 S₂O₃²⁻(aq) + I₂(aq) → S₄O₆²⁻(aq) + 2 I⁻(aq)

Which of the following statements is / are correct ?

(1)The oxidation number of sulphur in S₂O₃²⁻(aq) is +3.

(2)One of the half equations of this reaction is 2 S₂O₃²⁻(aq) → S₄O₆²⁻(aq) + 2e⁻.

(3)I₂(aq) is oxidised by S₂O₃²⁻(aq) in the reaction.

25.

Which of the following processes would produce sulphur dioxide ?

(1)roasting iron pyrite in air

(2)heating zinc with concentrated sulphuric acid

(3)mixing dilute hydrochloric acid with sodium sulphite

26.

Which of the following statements concerning the measures to reduce air pollutants is / are correct ?

(1)Scrubber can be used to reduce carbon monoxide.

(2)Catalytic converter can be used to reduce nitrogen monoxide.

(3)Electrostatic precipitator can be used to reduce unburnt hydrocarbons.

27.

Which of the following statements concerning but-2-ene are correct ?

(1)It has the same molecular formula as but-1-ene.

(2)It can form a polymer with the following as the repeating unit :

(3) It can decolourise acidified potassium permanganate solution.

28.

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
Molten sulphur is a good conductor of electricity.	Sulphur molecules are mobile in molten sulphur.

29.

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
Isotopes of an element have the same mass.	Isotopes of an element have the same number of protons.

30.

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
Carbon can form a large number of compounds with long carbon chains.	Carbon atoms can share electrons with one another.