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CIE iGCSE Co-Ordinated Science C8.3 Group VII properties Exam Style Questions Paper 1

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Question

The halogens are elements in Group VII of the Periodic Table.

They are ……1…… non-metals.

They become ……2…… in colour down the group.

Which words complete gaps 1 and 2?

▶️ Answer/Explanation
Halogens exist as diatomic molecules (e.g. \(\text{Cl}_2\), \(\text{Br}_2\)), so gap 1 is “diatomic”.
Going down Group VII: fluorine is pale yellow, chlorine is yellow-green, bromine is orange-brown, and iodine is grey/black — the colour gets darker, so gap 2 is “darker”.
✅ Answer: (A)

Question

Which statement about the halogens is correct?

A. They become lighter in colour down the group.
B. They are all gases at room temperature.
C. They are members of the same period of the Periodic Table.
D. They exist as diatomic molecules.

▶️ Answer/Explanation
Halogens actually become darker in colour down the group (chlorine pale yellow-green, bromine red-brown, iodine grey-black), so option A is wrong.
They are not all gases at room temperature — bromine is a liquid and iodine is a solid — and they belong to the same group (a column), not the same period, ruling out B and C.
Each halogen exists as a diatomic molecule, e.g. \(\text{Cl}_{2}\), \(\text{Br}_{2}\), \(\text{I}_{2}\), which is the correct statement.
✅ Answer: (D)

Question

Which statements about the halogens are correct?

  1. They are diatomic metals.
  2. Their atoms have seven outer-shell electrons.
  3. Going down the group, they change from solid to liquid to gas.
  4. Going down the group, they become darker in colour.

A. 1 and 2
B. 1 and 3
C. 2 and 4
D. 3 and 4

▶️ Answer/Explanation
Halogens are diatomic non-metals, not metals, so statement 1 is incorrect.
Halogen atoms have seven electrons in their outer shell, so statement 2 is correct.
Going down the group they change from gas to liquid to solid (not solid to liquid to gas), so statement 3 is incorrect, but they do become darker in colour, so statement 4 is correct.
✅ Answer: (C)

Question

Which statement about the halogens is not correct?

A. Iodine has a darker colour than chlorine.
B. They all exist as diatomic molecules.
C. They are all gases at room temperature.
D. They are all non-metals.

▶️ Answer/Explanation
Halogens are all diatomic, non-metallic, and darken in colour down the group (chlorine pale green, iodine dark grey/purple).
However, their physical state changes down the group — chlorine is a gas, bromine a liquid, and iodine a solid — so not all are gases at room temperature.
✅ Answer: (C)

Question

Which statements about the elements in Group VII of the Periodic Table are correct?

  1. Only one of them is a liquid at room temperature.
  2. Their colours become darker down the group.
  3. Their melting points and boiling points decrease down the group.
  4. They are all metallic elements called halogens.

A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 3 and 4

▶️ Answer/Explanation
Bromine is the only Group VII element that is liquid at room temperature, so statement 1 is correct.
The halogens are non-metals (not metallic), so statement 4 is false; melting/boiling points actually increase down the group, so statement 3 is also false.
✅ Answer: (B)
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