International A LevelChemistryEdexcelExam Questions2. Energetics, Group Chemistry, Halogenoalkanes and Alcohols2.5 Group 7

Group 7 (Edexcel International A Level Chemistry)

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2.5 Group 7

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2.5 Group 7

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11 mark

Which statement about the Group 7 elements chlorine, bromine and iodine is not correct?

  • boiling temperature increases down the group

  • reactivity increases down the group

  • first ionisation energy decreases down the group

  • electronegativity decreases down the group

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21 mark

Which silver halides are soluble in concentrated aqueous ammonia?

  • AgBr and AgI

  • AgCl and AgI

  • AgCl and AgBr

  • AgCl only

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1a1 mark

This question is about the reaction of potassium iodide with concentrated sulfuric acid.

a)
Which of these would not be seen?

  • misty fumes

  • black solid

  • yellow solid

  • dense white smoke

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1b
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b)
One of the reaction products is the gas H2S.
What is the change in oxidation number of sulfur as H2S forms?

  • −8

  • −6

  • −2

  • +6

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21 mark

Which of these increases as Group 7 is descended?

  • 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

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31 mark

When iodine is dissolved in a non-polar organic solvent, the solution formed is

  • purple

  • orange

  • colourless

  • brown

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4
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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?

  • 1 and 2

  • 1 and 3

  •  2 and 4

  • 3 and 4

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51 mark

Solid potassium bromide reacts with concentrated sulfuric acid.

Which of these substances does not form?

  • bromine

  • hydrogen bromide

  • hydrogen sulfide

  • sulfur dioxide

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