CIE iGCSE Co-Ordinated Science C8.3 Group VII properties Exam Style Questions Paper 1
Question
Which statement about the elements in Group I and in Group VII of the Periodic Table is correct?
A. Chlorine has a darker colour than iodine.
B. Each molecule of a halogen contains one atom.
C. Potassium reacts with cold water more vigorously than lithium.
D. The melting point of lithium is lower than the melting point of sodium.
▶️Answer/Explanation
Answer: C. Potassium reacts with cold water more vigorously than lithium.
Explanation: In Group I (alkali metals), reactivity increases down the group. Potassium (K) is below lithium (Li) in the group, so it reacts more vigorously with cold water. Chlorine is lighter in color than iodine, halogens are diatomic (e.g., Cl₂), and lithium has a lower melting point than sodium.
Question
Filament lamps require an inert atmosphere.
Which gas is used to fill these lamps?
(A) argon
(B) helium
(C) hydrogen
(D) oxygen
▶️Answer/Explanation
Ans: A
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
Ans: A
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
Ans : C
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
Ans: C
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
Ans : A
Question
Astatine is below iodine in Group VII of the Periodic Table. Which statements about astatine are correct?
1 It is monoatomic.
2 It is a solid at room temperature.
3 It is lighter in colour than iodine.
4 It does not react with aqueous potassium iodide.
A 1 and 2
B 1 and 3
C 2 and 4
D 3 and 4
▶️Answer/Explanation
Answer: C 2 and 4
Explanation: Astatine is a solid at room temperature and is less reactive than iodine, so it does not react with aqueous potassium iodide. It is not monoatomic (it exists as diatomic molecules like other halogens), and it is darker in color than iodine.
Question
Which statement about the elements from chlorine to iodine in Group VII of the Periodic Table is correct?
A. They are all gases at room temperature.
B. Their boiling points decrease.
C. Their colours become paler.
D. Their reactivities decrease.
▶️Answer/Explanation
Answer: D. Their reactivities decrease.
Explanation: As you move down Group VII (halogens), the reactivity of the elements decreases. Chlorine is more reactive than iodine, for example.
Question
Which statement about the halogens is not correct?
A. They are members of Group VII of the Periodic Table.
B. They are non-metals.
C. They become darker in colour down the group.
D. They exist as monoatomic gases.
▶️Answer/Explanation
Answer: D
Explanation: Halogens are diatomic molecules (e.g., Cl2, Br2, I2), not monoatomic gases. They are members of Group VII, are non-metals, and become darker in color down the group.
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?
A diatomic, darker
B diatomic, lighter
C monatomic, darker
D monatomic, lighter
▶️Answer/Explanation
Answer: A
Explanation: Halogens are diatomic non-metals, and they become darker in color as you move down the group.