化學 2008 年 DSE、CE 選擇題（第 2 頁）

11.

Which of the following statements concerning the reaction between acidified potassium permanganate solution and excess propene is INCORRECT ?

12.

Which of the following petroleum fractions has the highest carbon content?

13.

X and Z are metals. X reacts with Z(NO₃)₂ solution according to the following equation: X(s) + Z²⁺(aq) → X²⁺(aq) + Z(s) Which of the following deductions is correct ?

14.

The oxidation number of metal M in its oxide is +2. Complete reduction of 11.9 g of this oxide by hydrogen gas produces metal M and 2.7 g of water. What is the relative atomic mass of M ? (Relative atomic masses: H = 1.0, O = 16.0)

15.

The basicity of an acid is

16.

In which of the following groups of substances there exists a difference in bonding type among the substances ?

17.

Which of the following statements concerning a water molecule is/are correct ?

(1)The number of bonding electrons contributed by each hydrogen atom in the molecule is 2.

(2)The number of bonding electrons contributed by the oxygen atom in the molecule is 2.

(3)The total number of electrons in the molecule is 8.

18.

A small piece of potassium is dropped into a trough of water containing methyl orange. Which of the following observations is/are correct?

(1)The potassium moves about on the water surface with a hissing sound.

(2)The potassium dissolves in water and the solution turns red.

(3)The potassium burns with a golden yellow flame.

19.

Which of the following substances, when mixed with bromine water, would form a colourless solution ?

(1)sodium sulphite

(2)sodium chloride

(3)sodium iodide

20.

Comparing the elements in the second period of the Periodic Table, from lithium to fluorine, which of the following statements is/are correct ?

(1)They show a gradual change from having metallic property to having non-metallic property.

(2)They show a gradual increase in the number of electron shells in their atoms.

(3)They show a gradual decrease in melting point.