Question detail
Why is diamond considered very hard?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Structure and bonding of carbon
Question
- A. It has a layered structure that allows atoms to slide.
- B. It has strong covalent bonds in a giant structure.
- C. It contains delocalised electrons that enhance strength.
- D. It is made of simple molecules with weak forces.
Answer
The correct option is It has strong covalent bonds in a giant structure.. This answer is correct because it matches the approved learning objective to explain why diamond has a very high melting point in the subtopic Diamond.
Explanation
The correct option is It has strong covalent bonds in a giant structure.. It has strong covalent bonds in a giant structure. is correct because it directly supports the approved learning objective to explain why diamond has a very high melting point. This belongs to the subtopic Diamond within Structure and bonding of carbon, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Diamond.
Common mistake
Misunderstanding Diamond's Melting Point
Students often state that diamond's high melting point is due to strong covalent bonds being broken during melting.
Students should explain that the high melting point of diamond is due to the strong covalent bonds throughout the giant covalent structure, and that during melting, it is the weak intermolecular forces that are not relevant in this context.
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