Which one of them have a high melting point?
Correct answer: A. Diamond
- A. Diamond
- B. Sulphur
- C. Ice
- D. Zinc
Explanation
Diamond is a giant molecular compound with a network of strong covalent bonds between the regularly arranged carbon atoms. These covalent bonds which have a very high bond dissociation energy must be broken for a diamond to melt. Ice and Sulphur are both molecular compounds. Ice has hydrogen bonding, a hydrogen bond is only 5% as strong as a covalent bond. Sulfur has weak instantaneous dipole-induced dipole forces. Zinc has metallic bonding / electrostatic attraction between cations and a sea of electrons which is still weaker than covalent bonds in diamond.
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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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