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if this is from castlelearning its choices

1. H2O(s)

2. Na2O(s)

3. SO2(s)

4. CO2(s)

the answer is choice 2 because sodium, Na, is a metal. When a metal is bonded to a nonmetal such as oxygen, an ionic bond is formed. Ionic compounds have high melting points. All of the other are nonmetal which mean they are convalent compounds and covalent compounds have low melting points. JgLy<3 :)

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13y ago
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7y ago

For a binary compound tantalum carbide (TaC) has a melting point of 3 983 oC.
The ternary compound hafnium tantalum carbide has a melting point only slightly higher.

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Q: Which molecular solids has the highest melting point?
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