Which of these anions forms a white precipitate when tested with acidified silver nitrate solution?
CO32-
SO42-
OH –
Cl –
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Syllabus Edition
First teaching 2023
First exams 2025
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11.3 Some Reactions of the Halide Ions
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11.3 Some Reactions of the Halide Ions
Which of these anions forms a white precipitate when tested with acidified silver nitrate solution?
CO32-
SO42-
OH –
Cl –
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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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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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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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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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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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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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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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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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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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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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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.
What could Q be?
Sodium chloride
Sodium bromide
Potassium iodide
Potassium astatide
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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.
Which of the student’s diagrams are correct?
S only
R only
Both R and S
Neither R nor S
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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 Weakest |
|||
A B C D |
X- X- Y- Z- |
Y- Z- Z- X- |
Z- Y- X- Y- |
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