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Correct statements among a to d regarding silicones are - (a) They are polymers with hydrophobic character. (b) They are biocompatible. (c) In general, they have high thermal stability and low dielectric strength. (d) Usually, they are resistant to oxidation and used as greases.

1. (a), (b) and (d) only
2. (a), (b) and (c) only
3. (a), (b), (c) and (d)
4. (a) and (b) only

Correct answer: (a), (b) and (d) only

Solution

Options (a), (b), and (d) are correct because silicones are indeed hydrophobic polymers, they exhibit biocompatibility, and they are resistant to oxidation, making them suitable for use as greases. However, option (c) is incorrect as silicones typically have low thermal stability and high dielectric strength.

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