Home / iGCSE Chemistry Multiple Choice (Extended) : 2.7 Metallic bonding: Exam Style Questions Paper 2

iGCSE Chemistry Multiple Choice (Extended) : 2.7 Metallic bonding: Exam Style Questions Paper 2

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters
Question

Four substances, P, Q, R and S, are described.

  • P is diatomic.
  • Q is a good conductor of electricity when solid and when molten.
  • R is a silver solid with a very high melting point.
  • S reacts with oxygen to form a brown gas.

Which substances are metals?

A) P and Q
B) P and S
C) Q and R
D) R and S

▶️ Answer/Explanation
Solution

Ans: C

Let’s analyze each substance’s properties to identify metals:

P (diatomic): Most metals aren’t diatomic (except some like Hg in vapor). This suggests a non-metal (like O₂, N₂).

Q (conducts electricity when solid/molten): This is characteristic of metals (metallic bonding with delocalized electrons).

R (silver solid, high melting point): Typical metal properties (silvery luster, high m.p. due to strong metallic bonds).

S (forms brown gas with O₂): Likely a non-metal (e.g., nitrogen forms brown NO₂).

Therefore:

– Q and R show metallic properties

– P and S are non-metals

Metals are characterized by:

– Electrical conductivity

– Malleability/ductility

– Shiny luster

– High melting points (usually)

Question

Which row explains the malleability and electrical conductivity of a solid metal?

 malleabilityelectrical conductivity
ADelocalised electrons can move freely through the structure.Delocalised electrons can move freely through the structure.
BDelocalised electrons can move freely through the structure.Positive ions can move freely through the structure.
CRows of positive ions can slide over each other.Delocalised electrons can move freely through the structure.
DRows of positive ions can slide over each other.Positive ions can move freely through the structure.
▶️ Answer/Explanation
Solution

Ans: C

Metals are malleable because their positive ions are arranged in layers that can slide over each other when force is applied, while the sea of delocalized electrons maintains the metallic bonding.

Electrical conductivity in metals is due to the movement of delocalized electrons (not positive ions, making options B and D incorrect). Option A incorrectly attributes malleability to electron movement rather than ion layer movement.

Question

Which statement describes the structure of copper?

  1. It has a lattice of negative ions in a ‘sea of electrons’.
  2. It has a lattice of negative ions in a ‘sea of protons’.
  3. It has a lattice of positive ions in a ‘sea of electrons’.
  4. It has a lattice of positive ions in a ‘sea of protons’.
Answer/Explanation

Ans:

C

Question

Which row contains a description of metallic bonding and a property that is explained by reference to metallic bonding?

▶️Answer/Explanation

Ans:D

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