化學 2007 年 DSE、CE 選擇題（第 5 頁）

41.

Which of the following items does NOT require the use of the products obtained from electrolysis of brine ?

42.

Which of the following pairs of compounds can form condensation polymers ?

43.

Which of the following bonds or attractive forces exist in ammonium nitrate ?

(1)ionic bond

(2)covalent bond

(3)van der Waals’ forces

44.

Which of the following statements concerning a zinc–carbon cell are correct ?

(1)Manganese(IV) oxide acts as the anode.

(2)Ammonium chloride acts as an electrolyte.

(3)Zinc acts as the negative electrode.

45.

Using carbon as electrodes, which of the following solutions would give hydrogen upon electrolysis ?

(1)1 M silver nitrate solution

(2)2 M sodium hydroxide solution

(3)3 M calcium chloride solution

46.

Which of the following statements concerning the reaction of concentrated nitric acid with copper is / are correct ?

(1)A colourless gas is evolved.

(2)One mole of NO₃⁻(aq) ions requires one mole of electrons for reduction.

(3)It involves a displacement reaction.

47.

For Questions 48–50, 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
Galvanised iron is used for making food cans.	Zinc can prevent iron from rusting by sacrificial protection.

48.

For Questions 48–50, 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
Cracking is an endothermic reaction.	Cracking results in an increase of number of molecules.

49.

For Questions 48–50, 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
Soapy detergent can be used to treat oil spillage on sea surface.	Soapy detergent can act as an emulsifying agent for oil.