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CAIE IGCSE Chemistry Halogen and Halide Displacement

CAIE IGCSE Chemistry Halogen and Halide Displacement
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise predicting whether one halogen displaces a halide, writing balanced molecular or ionic equations and identifying the observed colour change.

How this is tested

  • predict displacement only when the added halogen is more reactive than the halide's element
  • write and balance the molecular or ionic equation with correct diatomic halogen formulae
  • use orange-brown bromine or brown iodine formation to explain the final solution colour

Question 2

[Maximum number: 2]

The elements in Group VII of the Periodic Table are known as the halogens. Halogens can form halide ions.

Question 2(d)

(a)

Bromine molecules have covalent bonding.

[ 2 ]

Question 2(d)(ii)

(i)

Name one halide ion which bromine molecules can displace.

[ 1 ]

Question 2(d)(iii)

(ii)

Explain why bromine can displace the halide ion in (d)(ii).

[ 1 ]