Home / iGCSE Chemistry 0620 Extended – 2.4 Ions and ionic bonds- Exam Style Questions Paper 2

iGCSE Chemistry 0620 Extended - 2.4 Ions and ionic bonds- Exam Style Questions Paper 2- New Syllabus

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters

Question

The diagram shows the positions of elements P and Q in the Periodic Table.

What is the formula of the compound that is formed between P and Q?

A. PQ
B. P2Q
C. PQ2
D. P2Q7

▶️ Answer/Explanation
From the diagram, P is in Group II so it forms a P²⁺ ion, while Q is in Group VII so it forms a Q⁻ ion. To balance the charges, you need two Q⁻ ions for every one P²⁺ ion, giving the formula PQ₂. This is typical for compounds between Group II metals and Group VII halogens.
✅ Answer: (C)

Question

Which statement describes the structure of sodium chloride?

A. a lattice of alternating positive and negative ions
B. a lattice of positive ions surrounded by a ‘sea’ of delocalised electrons
C. a mixture of sodium and chlorine atoms
D. a regular lattice of sodium and chlorine atoms

▶️ Answer/Explanation
Sodium chloride is an ionic compound. In its solid state, it forms a giant ionic lattice consisting of alternating positively charged sodium ions (\(\mathrm{Na}^+\)) and negatively charged chloride ions (\(\mathrm{Cl}^-\)).
✅ Answer: (A)

Question

Which statement describes all positive ions?

A. Positive ions have more electrons than neutrons.
B. Positive ions have more protons than neutrons.
C. Positive ions have more electrons than protons.
D. Positive ions have more protons than electrons.

▶️ Answer/Explanation
Positive ions (cations) are formed when an atom loses one or more electrons. Since the number of protons remains unchanged but the number of electrons decreases, positive ions have more protons than electrons. This is the defining characteristic of all positive ions.
✅ Answer: (D)
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