Silicones are fairly expensive but have many desirable properties such as
(i) strongly water repellent
(ii) good electricity insulators
(iii) non-stick properties
(iv) anti-foaming properties

Options

A. (i), (ii)
B. (ii), (iii)
C. (i), (ii), (iii), (iv)
D. (i), (ii), (iii)

Answer

C

Explanation

Silicones were originally developed as electrical insulators because they are more stable to heat than are organic polymers, and if they break down, they do not produce conducting materials as `C` does. They show resistance to oxidation and most chemicals Their strength and inertness are related to the stable silica-like skeleton of `Si-O-Si-O-Si` and very high strength of the `Si-O` bond.