A LevelChemistryCIETopic Questions11. Group 1711.3 Some Reactions of the Halide Ions

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First teaching 2023

First exams 2025

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Some Reactions of the Halide Ions (CIE A Level Chemistry)

Topic Questions

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11 mark

Which of these anions forms a white precipitate when tested with acidified silver nitrate solution?

  • CO32-

  • SO42-

  • OH –

  • Cl –

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21 mark

What is the correct chemical test and observation for the presence of an iodide ion?

  Chemical test Observation
A Acidified silver nitrate Yellow precipitate insoluble in concentrated ammonia
B Acidified barium chloride White precipitate insoluble in hydrochloric acid
C Acidified potassium nitrate Yellow precipitate insoluble in concentrated ammonia
D Bromine water Brown solution changes to colourless solution

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31 mark

What are the correct observations for the reaction of solid sodium bromide and concentrated sulfuric acid?

  • White fumes

  • Reddish brown gas and yellow solid produced

  • Yellow solid produced

  • Reddish-brown gas and pungent odour

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41 mark

Why does the oxidising power of the halogens decrease as the group is descended?

  • Shielding increases down the group therefore it is more difficult to accept an extra electron 

  • Atomic radius decreases down the group  

  • Shielding increases down the group therefore it is easier to donate an electron

  • The halogens become more electronegative down the group

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11 mark

A student observed the reactions when sodium bromide and sodium fluoride were each reacted separately with concentrated sulfuric acid and concentrated phosphoric acid. 

The observations are recorded in the table below.

 

Sodium bromide

Sodium fluoride

Conc. H2SO4

Conc. H3PO4

Steamy fumes and brown vapour

Colourless acidic gas formed

Colourless acidic gas formed

Colourless acidic gas formed

Which deduction can be made from these observations?

  • Concentrated phosphoric acid is a stronger oxidising agent than concentrated sulfuric acid.

  • Concentrated phosphoric acid is a stronger oxidising agent than bromine.

  • Concentrated sulfuric acid is a stronger oxidising agent than fluorine.

  • Concentrated sulfuric acid is a stronger oxidising agent than bromine.

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21 mark

The following two experiments are carried out with anhydrous potassium chloride and observations X and Y are made at the end of each experiment. 

The potassium chloride is dissolved in aqueous silver nitrate, and this is then added to aqueous ammonia- observation X. 

Concentrated sulfuric acid is added to the potassium chloride, and the fumes produced are bubbled into aqueous potassium iodide solution - observation Y. 

What are the observations X and Y?

 

X

Y

A

B

C

D

Colourless solution

Colourless solution

White precipitate

White precipitate

Brown solution

Colourless solution

Brown solution

Colourless solution

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31 mark

Element 85, astatine, is a halogen. If concentrated sulfuric acid is added to sodium astatide the resultant products are a mix of astatine, hydrogen astatide, hydrogen sulfide and sodium sulfate.

Which product is formed by the oxidation of one of the constituents of sodium astatide?

  • Sodium sulfate

  • Hydrogen sulfide

  • Hydrogen astatide

  • Astatine

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41 mark

Q is a salt of one of the Group 17 elements chlorine, bromine, iodine, or astatine.

The reaction scheme shows a series of reactions using a solution of Q as the starting reagent.

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What could Q be?

  • Sodium chloride

  • Sodium bromide

  • Potassium iodide

  • Potassium astatide

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51 mark

Two students, R and S, were asked to draw bar charts to represent how some properties of the halogens and their compounds differ in magnitude. Their diagrams are shown.

2-3-cie-ial-chemistry-diagram-q7hard

Which of the student’s diagrams are correct?

  • S only

  • R only

  • Both R and S

  • Neither R nor S

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61 mark

X, Y and Z represent different halogens. The table shows the results of nine experiments in which aqueous solutions of X2, Y2 and Z2 were separately added to separate aqueous solutions containing X-, Y- and Z- ions.

 

X- (aq)

Y- (aq)

Z- (aq)

X2 (aq)

Y2 (aq)

Z2 (aq)

No reaction

X2 formed

X2 formed

No reaction

No reaction

No reaction

No reaction

Z2 formed

No reaction

Which row in the following table contains the ions X-, Y- and Z-  in order of their decreasing strength as reducing agents?

 

Strongest      rightwards arrow      Weakest           

A

B

C

D

X-

X-

Y-

Z-

Y-

Z-

Z-

X-

Z-

Y-

X-

Y-

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11 mark

What is the complete list of all the products from the reaction of potassium bromide with concentrated sulfuric acid?

  • Potassium hydrogen sulfate, hydrogen bromide, bromine, water and sulfur dioxide

  • Potassium hydrogen sulfate, hydrogen bromide, bromine and water

  • Potassium hydrogen sulfate, hydrogen bromide and bromine

  • Potassium hydrogen sulfate and hydrogen bromide

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21 mark

Astatine is the element below iodine in Group 17 of the Periodic Table.

Which statement is most likely to be true for astatine?

  • Silver astatide reacts with dilute aqueous ammonia in excess to form a solution of a soluble complex.

  • Sodium astatide and hot concentrated sulfuric acid react to form astatine.

  • Astatine and aqueous potassium chloride react to form aqueous potassium astatide and chlorine.

  • Potassium astatide and hot dilute sulfuric acid react to form white fumes of only hydrogen astatide.

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31 mark

An unlabeled powder is known to be either a single sodium halide or a mixture of two different sodium halides. 

To determine what the powder consists of a sample of the powder was first dissolved in water. Then acidified aqueous silver nitrate was added to the new solution, and a pale yellow precipitate was formed. When concentrated aqueous ammonia was added, the precipitate partly dissolved, leaving a darker yellow precipitate. 

What might the powder have consisted of?

  • Sodium iodide only

  • Sodium bromide only

  • A mixture of sodium chloride and sodium bromide

  • A mixture of sodium chloride and sodium iodide

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41 mark

Solid potassium halides react with concentrated sulfuric acid, according to the following equations.

Reaction 1:     2KCl + H2SO4 → K2SO4 + 2HCl

Reaction 2:     2KBr  +  2H2SO4  →  K2SO4  +  SO2  +  Br2  +  2H2O

Reaction 3:     8KI +  5H2SO4  →  4K2SO4  +  H2S  +  4I2  + 4H2O

What is the largest change in the oxidation number of sulfur in each of these reactions?

 

Reaction 1

Reaction 2

Reaction 3

A

B

C

D

0

0

0

0

0

2

2

4

4

4

8

8

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