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 stablity and low dielectric strength.

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

 

  • Option 1)

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

  • Option 2)

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

  • Option 3)

    (a) and (b) only

  • Option 4)

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

Answers (2)
A admin

 

Silicones -

Polymeric organo-silicon compounds having (R2SiO)n general formula

R= alkyl or aryl groups

-

 

 

Cyclic or ring silicates -

Two tetrahedral units share two oxygen atoms per tetrahedron to form a closed ring containing basic unit \left ( SiO_{3} \right )_{n}^{2n-}

- wherein

E.g. Beryl \left ( Be_{3}Al_{2}Si_{6}O_{18} \right )

as we know

they hve high trermal stability nd elecrtric strength but(C) has low dielectric strength which is incorrect

(NCERT) CLASS 12th oart 2 page no. 330 line 3)

 


Option 1)

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

Option 2)

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

Option 3)

(a) and (b) only

Option 4)

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

The total revenue loss due to spread of pandemic Covid19 under the provision of CA 29.7-C is calculated for the period up to 30.06.2020 is amounting to Rs 16.02/-crores and the same was submitted to Authority.Further claim shall be followed

 

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