化學其他 DSE、CE 選擇題（第 7 頁）

61.

Which of the following concerning aqueous ammonia is correct?

62.

The main chemical constituent of bleaching power is calcium hypochlorite. Which of the following statements concerning bleaching power is INCORRECT ?

63.

In which of the following processes would hydrogen be produced ?

(1)electrolysis of an aqueous solution of potassium bromide

(2)passing steam over heated iron powder

(3)adding zinc granules to dilute ethanoic acid.

64.

For each of the following questions, 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 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
Both but-1-ene and but-2-ene can decolourize a solution of bromine in 1,1,1-trichloroethane.	Both but-1-ene and but-2-ene have the same molecular formula.

65.

For each of the following questions, 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 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
Methanoic acid is a non-electrolyte.	Methanoic acid is a covalent compound.

66.

For each of the following questions, 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 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
Lead can displace iron from iron(II) nitrate solution.	Lead occupies a higher position in the electrochemical series than iron.

67.

For each of the following questions, 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 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
Sodium chloride is used in the manufacture of soap.	Sodium chloride helps the precipitation of soap from soap solution.

68.

Which of the following substances, upon heating in a test tube, would undergo a chemical change ?

69.

Which of the following substances will NOT react with bromine water ?

70.

Consider the following equation: 5H₂S + 2KMnO₄(aq) + 3H₂SO₄(aq) → 5S(x) + 8H₂O(y) + 2MnSO₄(z) + K₂SO₄(aq) Which of the following combinations is correct ?

x	y	z
s	aq	aq
s	l	aq
aq	aq	s
aq	l	s