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.

(a), (b) and (c) only.

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(a), and (b) only.

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(a), (b), (c) and (d).

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(a), (b) and (d) only.

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Solution

The correct option is A (a), (b) and (d) only.
Silicones are the polymer of silicon-containing $[- (R)_{3} S i - O -]$ linkage.

It is a polymer with hydrophobic character thus used in making water-resistant seals.

They are biocompatible.

They have high thermal stability and low dielectric strength which is not correct.

They are also resistant to oxidation. Because of there wax-like texture, they are also used in greases.

Hence, the correct option is D.

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Similar questions

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.

Q79) Which of the following statements are true with respect to carbon nanotubes?

1.They are extremely light weight.

2. They have high temperature tolerance and low thermal expansion.

3. They are increasingly being used in electrical equipment.

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