1991 年

化學 · 共 36 題 · 點擊選項即時核對答案

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31.

Cl₂(aq) + 2I⁻(aq) → I₂(aq) + 2Cl⁻(aq)

Which of the following statements concerning the above reaction are correct ?

(1)I⁻(aq) acts as a reducing agent.

(2)Chlorine is a stronger oxidizing agent than iodine.

(3)The reaction is a displacement reaction.

32.

Which of the following gases can be dried by concentrated sulphuric acid ?

(1)hydrogen chloride

(2)ammonia

(3)sulphur dioxide

33.

Which of the following statements about hydrogen chloride is/are correct?

(1)It forms dense white fumes with ammonia gas.

(2)It dissolves in methylbenzene to form H⁺ and Cl⁻ ions.

(3)It turns dry litmus paper red.

34.

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
Distilled water is a poor conductor of electricity.	Distilled water contains an equal number of H⁺(aq) ions and OH⁻(aq) ions.

35.

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
In the preparation of soap, sodium chloride is added after the reaction between oil and sodium hydroxide has been completed.	Sodium chloride can increase the solubility of soap.

36.

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
Magnesium oxide dissolves faster in 1M hydrochloric acid than in 1M ethanoic acid.	Hydrochloric acid is a stronger acid than ethanoic acid.