化學 1997 年 DSE、CE 選擇題（第 5 頁）

41.

Aluminium is used to make window frames because

(1)it is strong.

(2)it can resist corrosion.

(3)it is the most abundant metallic element in the earth’s crust.

42.

Which of the following measures can reduce the formation of acid rain ?

(1)installing catalytic oxidisers in cars.

(2)using unleaded petrol in cars.

(3)using fuels of low sulphur content in cars.

43.

Which of the following elements are essential for plant growth ?

(1)potassium.

(2)phosphorus.

(3)silicon.

(4)nitrogen.

44.

Which of the following substances are used to produce nitric acid in industry ?

(1)air.

(2)water.

(3)nitrogen.

(4)ammonia.

45.

For Questions 45–50, each question consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Select one option from A to D according to the following table:

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Newspaper gradually turns yellow in air.	Sulphur-containing pollutants are present in air.

46.

For Questions 45–50, each question consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Select one option from A to D according to the following table:

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Sugar can be used as a preservative for fruits.	Sugar can act as a dehydrating agent.

47.

For Questions 45–50, each question consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Select one option from A to D according to the following table:

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
The reaction of sodium with water produces hydrogen.	The reaction of sodium with water is exothermic.

48.

For Questions 45–50, each question consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Select one option from A to D according to the following table:

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
The body of a motor car will corrode faster if common salt is sprinkled on roads after a heavy snow.	Common salt and water form a conducting solution.

49.

For Questions 45–50, each question consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Select one option from A to D according to the following table:

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Concentrated hydrochloric acid can react with silver.	Concentrated hydrochloric acid is a strong oxidising agent.