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化學 · 共 135 題 · 點擊選項即時核對答案

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21.

Which of the following statements concerning ammonium iodide is correct ?

22.

Which of the following processes would NOT give an obvious colour change ?

23.

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
All salt solutions are neutral.	All salts are formed from neutralisation.

24.

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
Sulphates can be oxidised to sulphites.	Oxidation number of sulphur in sulphates is higher than the oxidation number of sulphur in sulphites.

25.

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
Discharge of synthetic detergents into rivers may cause rapid growth of algae.	Synthetic detergents may contain nutrients for the growth of algae.

26.

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
The bleaching action of sodium sulphite lasts longer than that of sodium hypochlorite.	Sodium sulphite bleaches by oxidation while sodium hypochlorite bleaches by reduction.

27.

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
The boiling point of butane is higher than that of methane.	The van der Waals' forces between butane molecules are stronger than the forces between methane molecules.

28.

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
If concentrated hydrochloric acid is dripped onto one's hand, one should wash the hand immediately with concentrated ammonia solution.	Concentrated ammonia solution is a weak alkali.

29.

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
Fractional distillation can convert large alkane molecules to smaller alkane molecules and alkene molecules.	Fractional distillation involves breaking and forming of covalent bonds.

30.

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
When equal mass of Mg and Zn granules is added separately to excess dilute H₂SO₄, a greater amount of gas will be produced by Mg than Zn.	Mg is more reactive than Zn.