Which is the hardest natural substance on Earth?
Difficulty: Easy
About this MCQ
This Easy Everyday Science MCQ checks one syllabus fact. Candidates use it for NTS GAT General practice.
The question is: “Which is the hardest natural substance on Earth?”
The accepted answer is C. Diamond. Diamond, an allotrope of carbon with a tetrahedral crystal lattice, ranks 10 on the Mohs hardness scale and is the hardest known natural material.
- A. Gold
Why not A: Gold is soft and malleable.
- B. Iron
Why not B: Iron is hard relative to many metals but far softer than diamond.
- C. Diamond ✓
- D. Quartz
Why not D: Quartz is hard (Mohs 7) but diamond is Mohs 10.
Correct answer
C. Diamond
Explanation
Diamond, an allotrope of carbon with a tetrahedral crystal lattice, ranks 10 on the Mohs hardness scale and is the hardest known natural material.
Source: Mineralogy — Mohs scale
Tags: Chemistry
Relevant exams: NTS GAT General
Submitted by: MCQsHub Editorial
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