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Correct statements among (I) to (IV) regarding silicons are :
I. They are polymers with hydrophobic character.
II. They are biocompatible.
III. In general, they have high thermal stability and how dielectric strength.
IV. Usually, they are resistant to oxidation and used as greases.
  1. I and II only
  2. I, II, III only
  3. I, II, III and IV
  4. I, II and IV only


Solution

The correct option is C I, II, III and IV
Silicones are polysiloxanes with general chemical formula, [R2SiO]n, where R is an organic group such as:
CH3,C2H5,C6H5 etc.

Some of the useful properties of silicones are given below:
  1. They repel water (hydrophobic in nature) and form watertight seals.
  2. Silicones are biocompatible because these do not support microbiological growth and these have high gas permeability at room temperature.
  3. They have in general high thermal stability and high dielectric strength and resistance to oxidation and chemicals.
  4. Silicone grease is typically used as a lubricant for brake components in automiles, since it is stable at high temperature, is not water soluble and is a odourless viscous liquid.

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