Which is an incorrect statement?
Correct answer: C. The covalent bonds are rigid and non-directional
- A. The ionic bonds are non-directional in character
- B. The crystals of covalent compounds are made up of molecules
- C. The covalent bonds are rigid and non-directional
- D. Ionic compounds have high melting points and boiling points
Explanation
Covalent bonds are directional because they involve specific orientations of shared electron pairs, leading to definite molecular shapes. This makes Option C, which claims covalent bonds are non-directional, incorrect. Option A is correct since ionic bonds are non-directional due to uniform electrostatic forces. Option B is correct as covalent compounds are indeed made of molecules. Option D is correct because ionic compounds have high melting and boiling points due to strong ionic attractions.
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About Ionic and Molecular Crystals
Ionic crystals contain oppositely charged ions held by electrostatic forces, whereas molecular crystals contain discrete molecules joined by weaker intermolecular forces. Their structures explain differences in melting point, hardness, volatility, solubility and electrical conductivity, especially between solid and molten states.
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