Choose the correct statement:
Correct answer: A. Diamond is the hardest and graphite is softest
- A. Diamond is the hardest and graphite is softest
- B. Graphite is the hardest while lamp black is softest
- C. Coal is the hardest and coke is softest
- D. Diamond is the hardest and coke is softest
Explanation
Graphite is soft because it has weak intermolecular forces between its layers. Diamond is hard due to its giant covalent lattice and it has many strong covalent bonds.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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