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The two allotropes of carbon found naturally are
A{'text': 'Only diamond', 'label': 'A'}
B{'text': 'Diamond and Buckminsterfullerene only', 'label': 'B'}
C{'text': 'Diamond and graphite', 'label': 'C'}
D{'text': 'Coke and graphite only', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Diamond and graphite', 'label': 'C'}
1. Allotropes are different structural forms of the same element.
2. NCERT lists diamond and graphite as naturally occurring crystalline allotropes.
3. Diamond: hardest natural substance; each C bonded to 4 others in a tetrahedron.
4. Graphite: layered soft structure; conducts electricity due to delocalised π electrons.
_Source: NCERT Class 10 Science, Ch 4 "Carbon and its Compounds", §4.1_
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