8 questions · 9 marks · ≈ 9 min
Which statement about the Group 7 elements chlorine, bromine and iodine is not correct?
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boiling temperature increases down the group
reactivity increases down the group
first ionisation energy decreases down the group
electronegativity decreases down the group
Which silver halides are soluble in concentrated aqueous ammonia?
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AgBr and AgI
AgCl and AgI
AgCl and AgBr
AgCl only
This question is about the reaction of potassium iodide with concentrated sulfuric acid.
Which of these would not be seen?
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misty fumes
black solid
yellow solid
dense white smoke
One of the reaction products is the gas H2S. What is the change in oxidation number of sulfur as H2S forms?
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−8
−6
−2
+6
Which of these increases as Group 7 is descended?
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oxidising ability of the molecular halogens
reducing ability of the halide ions
electrostatic attraction between the nucleus and outer shell of electrons
electronegativity of the halogen atoms
When iodine is dissolved in a non-polar organic solvent, the solution formed is
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purple
orange
colourless
brown
Four tests used to identify ions are shown:
1 flame test 2 addition of acidified barium nitrate solution 3 addition of acidified silver nitrate solution 4 addition of sodium hydroxide solution, then testing any gas with indicator paper
Which tests could be used to positively identify the ions in ammonium chloride?
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1 and 2
1 and 3
2 and 4
3 and 4
Solid potassium bromide reacts with concentrated sulfuric acid.
Which of these substances does not form?
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bromine
hydrogen bromide
hydrogen sulfide
sulfur dioxide
A student adds chlorine water to an aqueous solution of an unknown potassium halide. A small volume of cyclohexane (density = 0.79 g cm–3) is then added and the mixture is shaken thoroughly.
The upper layer turns purple/violet.
Which halide was present in the original solution?
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KBr
KCl
KF
KI