Question

Which of the following are the properties of silicones? I. Water repelling in nature II. High thermal stability III. Easily oxidisable IV. High dielectric strength

• A. I, II, IV only
• B. I, II, III only
• C. II, III, IV only
• D. I, III, IV only

Hint:

Silicones are "water-repelling" insulators with great heat resistance!

Answer 1

The Correct Option is A

Step 1: Know what silicones are.
Silicones are synthetic polymers built on a repeating $Si-O-Si$ backbone with organic groups (like methyl) attached to silicon.

Step 2: Check water repelling (I).
The outer methyl groups face outward and dislike water, so silicones are water repelling. Statement I is true.

Step 3: Check thermal stability (II).
The $Si-O$ bond is very strong, so silicones stay stable at high temperatures. Statement II is true.

Step 4: Check easily oxidisable (III).
Silicones are chemically inert and resist oxidation, so they are not easily oxidisable. Statement III is false.

Step 5: Check dielectric strength (IV).
They are excellent electrical insulators with high dielectric strength. Statement IV is true.

Step 6: Conclusion.
The correct properties are I, II and IV only. \[ \boxed{\text{I, II, IV only}} \]