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