化學其他 DSE、CE 選擇題（第 11 頁）

101.

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.

102.

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.

103.

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.

104.

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.

105.

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.

106.

For Questions 45–50, 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
The melting point of hydrogen chloride is lower than that of potassium chloride.	Hydrogen chloride is a covalent compound whereas potassium chloride is an ionic compound.

107.

For Questions 45–50, 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
Zinc-carbon dry cells are rechargeable.	The electrolyte used in zinc-carbon dry cells is potassium hydroxide.

108.

For Questions 45–50, 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
The resistance of aluminium to corrosion can be enhanced by anodisation.	During anodisation, aluminium oxide on the metal surface is reduced to aluminium.

109.

For Questions 45–50, 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
The cost of town gas goes up when the cost of crude oil rises.	Town gas is manufactured from naphtha.

110.

For Questions 45–50, 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
The volume of hydrogen liberated at room temperature and pressure by the reaction between 10 cm³ of 10 M hydrochloric acid and excess zinc granules is greater than that between 50 cm³ of 2 M hydrochloric acid and excess zinc granules.	10 M hydrochloric acid is a stronger acid than 2 M hydrochloric acid.