3.2.3.1 Trends in physical properties [of the halogens]

1.

Multiple Choice

30 sec

1 pt

Which statement is correct about the reaction between concentrated sulfuric acid and solid sodium bromide?

Bromide ions are reduced.

Hydrogen bromide and sulfur are formed.

Sulfuric acid acts as an oxidising agent.

Bromine and hydrogen sulfide are formed.

2.

Multiple Choice

30 sec

1 pt

Which is the best technique to remove the silver chloride that forms when aqueous solutions of silver nitrate and sodium chloride react?

Refluxing

Evaporation

Filtration

Distillation

3.

Multiple Choice

30 sec

1 pt

Which statement about astatine is correct?

Astatine has a greater electronegativity than bromine

Astatine is a better oxidising agent than bromine

Astatine has a greater boiling point than bromine

Astatine has a greater first ionisation energy than bromine

4.

Multiple Choice

30 sec

1 pt

Which species is not produced by a redox reaction between solid sodium iodide and concentrated sulfuric acid?

Na₂SO₄

H₂S

S

SO₂

5.

Multiple Choice

30 sec

1 pt

Which equation represents a reaction that does take place?

Cl₂ + 2NaI ⟶ 2NaCl + I₂

Br₂ + 2NaCl ⟶ 2NaBr + Cl₂

NaCl + H₂O ⟶ HCl + NaOH

2HCl + H₂SO₄ ⟶ Cl₂ + SO₂ + 2H₂O

6.

Multiple Choice

30 sec

1 pt

Which species is the best oxidising agent?

Cl₂

Cl⁻

Br ₂

Br⁻

7.

Multiple Choice

30 sec

1 pt

Which of these substances reacts most rapidly to produce a silver halide precipitate with acidified silver nitrate?

CH₃Br

CH₃Cl

CH₃F

CH₃l

8.

Multiple Choice

30 sec

1 pt

The boiling points of the halogens increase down Group VII because

covalent bond strengths increase.

bond polarities increase.

the surface areas of the molecules increase.

electronegativities increase.

9.

Multiple Choice

30 sec

1 pt

An aqueous solution of a sodium salt gave no precipitate when treated with either silver nitrate solution or barium chloride solution. Which one of the following could be the formula of the sodium salt?

NaI

Na₂SO₄

NaBr

NaF

10.

Multiple Choice

30 sec

1 pt

On heating, magnesium reacts vigorously with element X to produce compound Y. An aqueous solution of Y, when treated with aqueous silver nitrate, gives a white precipitate that is readily soluble in dilute aqueous ammonia. What is the minimum mass of X that is needed to react completely with 4.05 g of magnesium?

11.83 g

5.92 g

5.33 g

2.67 g

11.

Multiple Choice

30 sec

1 pt

Which one of the following can act as an oxidising agent but not as a reducing agent?

CH₃CHO

Fe²⁺

I⁻

MnO₄^-

12.

Multiple Choice

30 sec

1 pt

Which one of the following statements concerning halogen chemistry is true?

Sodium chloride produces chlorine when treated with concentrated sulphuric acid.

Sodium chloride produces chlorine when treated with bromine.

Sodium bromide produces bromine when treated with concentrated sulphuric acid.

Sodium bromide produces bromine when treated with iodine in aqueous potassium iodide.

13.

Multiple Choice

30 sec

1 pt

An aqueous solution of a white solid gives a yellow precipitate with aqueous silver nitrate. The formula of the white solid could be

AgBr

AgI

NaBr

NaI

14.

Multiple Choice

30 sec

1 pt

What will you see when a solution of silver nitrate is added to a solution containing bromide ions, and concentrated aqueous ammonia is added to the resulting mixture?

a white precipitate soluble in concentrated aqueous ammonia

a white precipitate insoluble in concentrated aqueous ammonia

a cream precipitate soluble in concentrated aqueous ammonia

a yellow precipitate insoluble in concentrated aqueous ammonia

15.

Multiple Choice

30 sec

1 pt

Which one of the following statements is true?

A blue solution containing the ion [CoCl₄]²⁻ turns pink when added to an excess of water.

A purple solution is formed when chlorine is bubbled into aqueous sodium bromide.

A yellow precipitate is formed when aqueous silver nitrate is added to aqueous sodium chloride.

A green solution containing the ion [CuCl4]2− turns blue when added to an excess of concentrated hydrochloric acid.

16.

Multiple Choice

30 sec

1 pt

In which one of the following reactions does the metal species undergo reduction?

MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

[Cu(H₂O)₆]²⁺+ 4Cl⁻ → [CuCl₄]²⁻ + 6H₂O

CrO₇^2- + 2OH⁻→ 2CrO₄^2- + H₂O

TiO₂ + 2C + 2Cl₂ → TiCl₄ + 2CO

17.

Multiple Choice

30 sec

1 pt

A white salt dissolves in water to give a solution which gives a cream coloured precipitate when aqueous silver nitrate is added. This precipitate is insoluble in dilute aqueous ammonia but is soluble in concentrated aqueous ammonia. The original white salt could be

AgI

NaI

AgBr

NaBr

18.

Multiple Choice

30 sec

1 pt

The reaction between sodium iodide and concentrated phosphoric acid produces hydrogen iodide but no iodine. The reaction of sodium iodide with concentrated sulphuric acid produces mainly iodine. The difference in product occurs because, in comparison with sulphuric acid, phosphoric acid is

the weaker acid.

the stronger oxidising agent.

the weaker oxidising agent.

the stronger reducing agent.

19.

Multiple Choice

30 sec

1 pt

Which one of the following is not a correct trend down Group VII?

The first ionisation energy of the atom decreases.

The oxidising power of the element increases.

The electronegativity of the atom decreases.

The boiling point of the element increases.

20.

Multiple Choice

30 sec

1 pt

Which one of the following statements is true?

Bromine liberates iodine from aqueous sodium iodide.

Chlorine liberates fluorine from aqueous sodium fluoride.

Silver iodide is soluble in aqueous ammonia.

Concentrated sulphuric acid liberates chlorine from solid sodium chloride.

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