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CAIE A-Level Chemistry AS 11.2 The Chemical Properties of the Halogen Elements and the Hydrogen Halides Questions

Practise halogen oxidising-strength trends, reactions with hydrogen and the thermal stability of hydrogen halides.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • use the decreasing oxidising strength Cl2 > Br2 > I2 to predict halide displacement
  • describe reactions of halogens with hydrogen and compare their relative reactivity
  • explain decreasing hydrogen-halide thermal stability through weaker H–X bonds down the group

Covered syllabus points

11.2.1—Reactivity of the elements as oxidising agents11.2.2—Reactions of the elements with hydrogen11.2.3—Thermal stabilities of the hydrogen halides

Question 1

[Maximum number: 1]

ICl is made when Cl2\mathrm{Cl}_{2} and I2\mathrm{I}_{2} react together.

Cl2+I2⇌2ICl\mathrm{Cl}_{2}+\mathrm{I}_{2} \rightleftharpoons 2 \mathrm{ICl}

ICl reacts with water.

5ICl+3H2O→5HCl+HIO3+2I25 \mathrm{ICl}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 5 \mathrm{HCl}+\mathrm{HIO}_{3}+2 \mathrm{I}_{2}

Which row is correct?

oxidation number of I in ICl

reaction occurring when ICl reacts with H2O\mathrm{H}_{2} \mathrm{O}

+1

the iodine atoms are oxidised to form I2\mathrm{I}_{2}

+1

the iodine atoms are oxidised to form HIO3\mathrm{HIO}_{3}

-1

the chlorine atoms are reduced to form HCl

-1

the iodine atoms are oxidised to form HIO3\mathrm{HIO}_{3}

Question 2

[Maximum number: 1]

Which statement relating to the elements in Group 17 and their compounds is correct?

A

Bromine will reduce KI to form iodine.

B

Iodide ions react to form a white precipitate when added to silver nitrate solution.

C

Bromide ions react to form a white precipitate when added to silver nitrate solution.

D

Chlorine reacts with hydrogen to form a colourless gas.

Question 3

[Maximum number: 1]

A test-tube of HBr(g) and a separate test-tube of HI(g) are heated to the same temperature.
Which combination of observations is possible?

test-tube of HBr(g)\mathrm{HBr}(\mathrm{g})

test-tube of HI(g)\mathrm{HI}(\mathrm{g})

a brown vapour appears

no change

a purple vapour appears

no change

no change

a brown vapour appears

no change

a purple vapour appears

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