Home / iGCSE Chemistry (0620) Core:8.3 Group VII properties: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core:8.3 Group VII properties: Exam Style Questions Paper 1- New Syllabus

iGCSE Chemistry (0620) Core Paper 1 - All Chapters

Question

The diagram shows elements W, X, Y and Z in a section of the Periodic Table.
Which statement about the reactivity of the elements is correct?
A. X is more reactive than Y, and W is more reactive than Z.
B. X is more reactive than Y, and Z is more reactive than W.
C. Y is more reactive than X, and W is more reactive than Z.
D. Y is more reactive than X, and Z is more reactive than W.
▶️ Answer/Explanation
Correct Option: C

Detailed solution:

Looking at the positions in the Periodic Table, W and X are Group I alkali metals, while Y and Z are Group VII halogens. For Group I metals, reactivity increases down the group, so Y is more reactive than W (Y is below W). Looking at X and Z: X is a Group I metal and Z is a Group VII halogen in the same period. Across a period, metals are on the left and are more reactive than non-metals on the right in terms of losing electrons. However, the diagram shows relative positions, and Y (being lower down Group I) is more reactive than X (higher up), so Y is more reactive than X. For non-metals, reactivity decreases down Group VII, so W (above Z) would be a different element. Based on the diagram arrangement, Y is more reactive than X, and W is more reactive than Z, making option C the correct statement.

Question

Which statements about the halogens are correct?
  1. They are all diatomic molecules.
  2. They are all gases at room temperature and pressure.
  3. The density of the elements increases down the group.
  4. The reactivity of the elements increases down the group.
A. 1 and 2
B. 1 and 3
C. 2 and 4
D. 3 and 4
▶️ Answer/Explanation
Correct Option: B

Detailed solution:

All halogens exist as diatomic molecules like $Cl_2$, $Br_2$, and $I_2$, so statement 1 is correct. However, they are not all gases—bromine is a liquid and iodine is a solid at room temperature, so statement 2 is false. Density definitely increases as you go down the group because the atoms get much heavier, so statement 3 is correct. Reactivity in Group VII actually decreases down the group as it gets harder for larger atoms to attract an extra electron, making statement 4 false. So only statements 1 and 3 are correct.

Question

X, Y and Z are each one of the elements chlorine, bromine and iodine.
When aqueous X is mixed with aqueous ions of Y, there is no reaction.
When aqueous Y is mixed with aqueous ions of Z, there is no reaction.
Which statement is correct?
A. X is more reactive than Y.
B. X is a pale yellow-green gas at room temperature and pressure.
C. Y is a red-brown liquid at room temperature and pressure.
D. Z is less reactive than Y.
▶️ Answer/Explanation
Correct Option: C

Detailed solution:

No reaction means the halogen added is less reactive than the halide it’s mixed with. X with Y ions → no reaction, so X is less reactive than Y. Y with Z ions → no reaction, so Y is less reactive than Z. Reactivity order (least to most) is X < Y < Z. So X is iodine (least reactive), Y is bromine, and Z is chlorine. Bromine (Y) is indeed a red-brown liquid at room temperature and pressure, making C correct.

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