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CAIE A-Level Chemistry AS 11.1 Physical Properties of the Group 17 Elements Questions

Practise describing halogen colour, physical state and volatility trends and explaining them using molecular forces.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • recall the colours and physical states of chlorine, bromine and iodine at room conditions
  • explain decreasing volatility down the group through stronger London forces between larger molecules
  • explain the general weakening of X–X bonds through longer bonds and reduced orbital overlap

Covered syllabus points

11.1.1—Colours and the trend in volatility11.1.2—Trend in the bond strength of the halogen11.1.3—The volatility of the elements

Question 1

[Maximum number: 1]

Which row correctly describes the properties of the halogens as Group 17 is descended from chlorine to iodine?

volatility

strength as

oxidising agent

decreases

decreases

decreases

increases

increases

decreases

increases

increases

Question 2

[Maximum number: 1]

The strengths of the covalent bonds within halogen molecules, and the van der Waals' forces between halogen molecules, vary going down Group 17 from chlorine to bromine to iodine.

Which row shows these correctly?

strength of covalent bonds

strength of van der Waals' forces

decreases

decreases

decreases

increases

increases

decreases

increases

increases

Question 3

[Maximum number: 1]

The table shows statements about some of the properties of halogens and their compounds and explanations for these properties.

Which row shows a correct statement about the property and a correct explanation for the statement?

statement

explanation

iodine is a solid at room temperature

the I-I bond strength is high

the decomposition of hydrogen iodide is more endothermic than the decomposition of hydrogen chloride

chlorine is more reactive than iodine

when chlorine is bubbled into aqueous potassium iodide, a purple solution is seen

chlorine is a stronger oxidising agent than iodine

when concentrated sulfuric acid is added to solid potassium iodide, a purple vapour is seen

iodide ions are being oxidised to iodine by the sulfuric acid

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