An example of a non-polar molecular crystal is _.
Correct answer: B. Iodine
- A. Ice
- B. Iodine
- C. Sugar
- D. Salt
Explanation
Option A: Ice, glucose and urea are examples of hydrogen bonded molecular solids due to the hydrogen bonded in the molecular solids. Option B: Iodine is a non-polar molecule, with only one bond - with itself - and so there cannot be any unfair sharing of electrons to any degree, so it is completely non-polar.Option C and Option D Sugars (e.g., glucose) and salts are polar molecules, and they dissolve in water, because the positive and negative parts of the two types of molecules can distribute themselves comfortably among one another.
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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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