Correct statements among a to d regarding silicones are
(i) they are polymers with hydrophobic character
(ii) they are biocompatible
(iii) in general, they have high thermal stability and low dielectric strength
(iv) usually they are resistant to oxidation and used as greases.
(i) they are polymers with hydrophobic character
(ii) they are biocompatible
(iii) in general, they have high thermal stability and low dielectric strength
(iv) usually they are resistant to oxidation and used as greases.
- (A)(i), (ii), (iii) and (iv)
- (B)(i), (ii) and (iii)
- (C)(i) and (ii) only
- (D)(i), (ii) and (iv)✓ Correct
Answer: (D)
Solution
Silicones are organosilicon polymers. Their organic groups make them hydrophobic, and they are biocompatible enough for medical use, so those statements stand; they also resist oxidation and serve as greases, so that holds too. The statement that fails pairs high thermal stability with low dielectric strength, whereas silicones in fact have high dielectric strength. The sound set is the hydrophobic, biocompatible and oxidation-resistant-grease statements.
JEE Main · 2019 · 09 Jan 2019 · Shift 1 · Single correct option