CAIE A-Level Chemistry AS 11.1.3 The Volatility of the Elements Questions

Practise explaining decreasing halogen volatility through electron count, polarizability and instantaneous dipole forces.

Exam points

state that electron number and molecular polarizability increase from Cl2 to Br2 to I2
link greater polarizability to stronger instantaneous dipole–induced dipole attractions
link stronger intermolecular attractions to higher boiling point and therefore lower volatility

[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

All question bank results loaded

CAIE A-Level Chemistry AS 11.1.3 The Volatility of the Elements Questions question 1