Exam code: 9701
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The Chemical Properties of the Halogen Elements & the Hydrogen Halides
Aqueous iodine is added to aqueous potassium bromide.
Which statement describes the outcome?
Bromide ions are oxidised to bromine.
Iodine is oxidised to iodide ions.
No reaction occurs.
Potassium bromide is reduced to bromine.
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Chlorine gas is bubbled through aqueous potassium iodide.
Which statement describes the outcome?
Chlorine is oxidised to chlorate(V) ions.
Chlorine is oxidised to chloride ions.
Iodide ions are oxidised to iodine.
There is no observable reaction.
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Which halide ions act as reducing agents when solid sodium halides react with concentrated sulfuric acid?
Br− and I− only
Cl− and Br− only
Cl−, Br− and I−
I− only
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On being heated, hydrogen iodide breaks down more quickly than hydrogen chloride.
Which statement does not explain this difference in rate?
The activation energy for the decomposition of HI is lower than that of HCl.
The decomposition of HCl is more endothermic than the decomposition of HI.
The H–Cl bond is stronger than the H–I bond.
The H–I bond is longer than the H–Cl bond.
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On contact with a hot glass rod, which gaseous hydride most readily decomposes into its elements?
ammonia
hydrogen chloride
hydrogen iodide
steam
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When a hot platinum wire is plunged into a test tube of hydrogen chloride, no change occurs. However, if the experiment is repeated with hydrogen iodide, the gas is decomposed into its elements.
Which factor does not explain this observation?
the activation energy of the decomposition reaction
the difference in electronegativity between the hydrogen and halogen atoms
the size of the halogen atom
the strength of the hydrogen–halogen bond
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Which row correctly describes the observations when aqueous silver nitrate, followed by aqueous ammonia, is added to the specified halide ion?
Row | Halide ion | Colour of precipitate with AgNO3 (aq) | Observation on adding aqueous ammonia |
|---|---|---|---|
A | Cl− | white | dissolves in dilute aqueous ammonia |
B | Br− | white | dissolves in concentrated aqueous ammonia only |
C | I− | cream | remains insoluble in concentrated aqueous ammonia |
D | Br− | cream | dissolves in dilute aqueous ammonia |
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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 added to separate aqueous solutions containing X−, Y− and Z− ions.
X− (aq) | Y− (aq) | Z− (aq) | |
|---|---|---|---|
X2 (aq) | no reaction | no reaction | no reaction |
Y2 (aq) | X2 formed | no reaction | Z2 formed |
Z2 (aq) | X2 formed | no reaction | no reaction |
What is the correct order of decreasing strength of the ions X−, Y− and Z− as reducing agents?
X− > Y− > Z−
X− > Z− > Y−
Y− > Z− > X−
Z− > X− > Y−
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A dark red/brown solution is formed when a halide salt containing the halide ion Y- reacts with aqueous chlorine. This solution then forms a violet solution when shaken with a cyclohexane solution.
What is halogen, Y?
bromide
fluorine
iodide
iodine
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Which statement about Group 7 elements is not correct?
Astatine has a lower first ionisation energy than iodine.
Fluorine is the weakest reducing agent in Group 17.
Iodomethane produces a silver halide precipitate with aqueous silver nitrate in ethanol faster than chloromethane or bromomethane.
The bond dissociation energy of the hydrogen halides increases from HCl to HI.
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