11 mark
What happens when iodine is bubbled through aqueous potassium bromide?
Iodine is oxidised to iodide ions.
Potassium bromide is reduced to bromine.
Bromide ions are oxidised to bromine.
No reaction occurs.
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Syllabus Edition
First teaching 2023
First exams 2025
|
The Chemical Properties of the Halogen Elements & the Hydrogen Halides (CIE A Level Chemistry)
Topic Questions
21 mark
What happens when chlorine gas is bubbled through aqueous potassium iodide?
Iodide ions are oxidised to iodine.
Chlorine is oxidised to chlorate (V) ions.
Chlorine is oxidised to chloride ions.
There is no observable reaction.
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31 mark
When halogen sodium salts react with concentrated sulfuric acid which of the halide ions, chloride, bromide or iodide, acts as a reducing agent?
|
1 |
Cl– |
|
2 |
Br– |
|
3 |
I– |
1, 2 and 3
1 and 2
2 and 3
1 only
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11 mark
On being heated, hydrogen iodide breaks down more quickly than hydrogen chloride.
Which statements does not explain this faster rate?
The breakdown of HCl is more exothermic than that of HI
The reaction of the breakdown of HI has smaller activation energy than that of HCl
The HCl bond is stronger than the HI bond
The HI bond is longer than the HCl bond
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21 mark
On contact with a hot glass rod, which gaseous hydride most readily decomposes into its elements?
Ammonia
Steam
Hydrogen iodide
Hydrogen chloride
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31 mark
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 result in this behaviour?
the strength of the hydrogen-halogen bond
the standard enthalpy of formation, ΔHfθ, of each of the products of decomposition
the electronegativity of the chlorine atom
the size of the halogen atom
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