Why SiO2 has a higher melting point than NaCl, given the fact that ionic bonds are stronger than covalent bonds?
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Explanation:
Consider GaAs (covalent crystal) and NaCl (ionic crystal); both have nearly same lattice constant. The Ga-As interatomic distance is shorter than the Na-Cl interatomic distance; but GaAs has a smaller band-gap than NaCl, but a higher melting point.
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Explanation:
It s a giant molecule which has Ver strong which have very strong covalent bonds which are difficult to break
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