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JEE Main 20199 JanuaryMorning Shift
Exam
JEE Main
Year
2019
Date
9 January
Shift
Morning Shift
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main 2019 · 9 January · Morning Shift · Chemistry · p Block Elements (Group 13 & 14)

Correct statements among regarding silicones are: ( a ) They are...

Correct statements among regarding silicones are:

(a)( a ) They are polymers with hydrophobic character.

(b)( b ) They are biocompatible.

(c)( c ) In general, they have high thermal stability and low dielectric strength.

(d)( d ) Usually, they are resistant to oxidation and used as greases.

Options

  1. A(a),(b)( a ) , ( b ) and (c)( c ) only
  2. B(a)( a ) and (b)( b ) only
  3. C(a),(b),(c)( a ) , ( b ) , ( c ) and (d)( d )
  4. D(a),(b)( a ) , ( b ) and (d)( d ) only

Correct answer

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

Step-by-step solution

Silicones with medium length chains behave as viscous oils, jellies and greases. They are chemically inert, i.e., resistant to oxidation. Since silicones are surrounded by non-polar alkyl groups, hence, are hydrophobic in nature. Being biocompatible, they are used in surgical and cosmetic implants. Hence, all options are correct.
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