Covalent molecules have low melting and boiling point because:
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A.
they are generally gaseous in nature
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B.
they have weak intermolecular forces
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C.
they have strong bonds within the molecule
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D.
they have strong electrostatic intermolecular forces
Correct Answer:
B. they have weak intermolecular forces
Explanation:
The correct answer is Option B: they have weak intermolecular forces.
Covalent compounds consist of molecules held together by weak intermolecular forces, such as van der Waals forces or dipole-dipole interactions. Because these attractions between individual molecules are relatively weak, only a small amount of thermal energy is required to overcome them and change the state of the substance from solid to liquid or liquid to gas. While the covalent bonds within the molecules themselves are very strong, the low melting and boiling points are a direct result of the ease with which these separate molecules can be pulled apart from one another.
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