化學 2006 年 DSE、CE 選擇題（第 2 頁）

11.

Consider the following information:

Compound	Relative molecular mass
CH₃CH₂OH	46
CH₃CH₂OCH₃	60
CH₃CH₂CO₂CH₃	88
C₆H₁₂O₆	180

When 1 g of each of these compounds undergoes complete combustion, which one will produce the greatest number of moles of carbon dioxide?

12.

X and Y are two different metals. Which of the following shows that Y is more reactive than X ?

13.

Element X has two isotopes, ³⁹X and ⁴¹X. The table below lists the percentage abundance of the two isotopes:

Isotope	Percentage abundance
³⁹X	93.2
⁴¹X	6.8

What is the relative atomic mass of X ?

14.

Which of the following compounds is formed from the reaction of propene with chlorine?

15.

Element X forms two oxides XO and XO₂. If 1 mole of XO contains n atoms, 2 moles of XO₂ would contain

16.

When substance X is treated with an aqueous solution of iron(II) sulphate, the iron(II) ions act as oxidizing agent. X may be

17.

Which of the following processes is/are application(s) of neutralization?

(1)using scrubbers to remove sulphur dioxide from fuel gas in a power station

(2)using catalytic converters to remove nitrogen oxides in car exhaust

(3)using sodium hydroxide solution to remove copper(II) ions in industrial waste water

18.

Rain water samples collected in industrial areas have pH lower than those collected in the countryside. Which of the following air pollutants is/are responsible for this phenomenon?

(1)carbon dioxide

(2)nitrogen dioxide

(3)particulates

19.

In which of the following atoms or ions is the outermost shell an octet ?

(1)Li⁺

(2)Ne

(3)S²⁻

20.

Which of the following substances contain calcium carbonate as the main chemical constituent?

(1)limestone

(2)chalk

(3)marble