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Silicones are water repelling in nature ...

Silicones are water repelling in nature due to.

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Assertion (A) : Silicones are water repelling in nature Reason (R) : Silicones are organosilicon polymers, which have (-R_(2)SiO-) as repeating unit.

Silicones are used as.

Silicones are sunthetic polyners conitainging repeated R_2 SiO units . Since the empirical formula is that of a ketone (R_2 CO) , the name Silicone has eeen given to these materils . Siliconse can be makde intio oils , rubbery eleastomers and resins . They find a varely of appoications because of their chemical inctness , water repelling nature m heat resistance and good electical insulationg property . Commerical silicon polumers are usuallly metghly synthesised by the hudroluysis of R_2 SiCl_2 [R = Methyl (Me ) or phenyl ( phi)] . If we mix SiMe_3Cl with SiMe_2Cl_2 , we get silicones of the type .

Silicon is the second most abundant element (~27.2%) in the earth's after oxygen (45.5 %) Carbon. Silicon, germanium, tin and lead constitute the group 14 of the periodic table. Chemistry of silicon is distinctly different from that of carbon. For example, under standard conditions CO_(2) is a gas whereas SiO_(2) is a covalent solid. Draw the structure of the anion present in pyroxene (MgCaSi_(2)O_(6)) . Silicones are important synthetic polymers which find extensive applications due to their chemical inertness and water repelling nature. Thet are produced via the following reactions. 2 C_(6)H_(5)Cl +Si underset("370 K")overset("Cu")to A A underset(-HCl)overset(H_(2)O)to B

Silicones repel water due to:

Silicones are synthetic polymers containing repeated R_2 SiO units . Since the empirical formula is that of a ketone (R_2 CO) , the name Silicone has been given to these materials . Silicone can be made into oils , rubbery elastomers and resins . They find a variety of applications because of their chemical inertness , water repelling nature, heat resistance and good electrical insulating property . Commerically silicon polymers are usually synthesised by the hudrolysis of R_2 SiCl_2 [R = Methyl (Me ) or phenyl ( phi)] . If we start with SiMeCl_3 as the starting material silicones formed is :

Assertion (A) : Silicones are hdyreopbhobic in nature . Reason (R) : Si -O - Si likages are moisture sensitive .

Water passes into a cell due to

The water potential increases due to

Water rises in the stem due to

RESONANCE ENGLISH-TEST SERIES-CHEMISTRY
  1. Select in incorrect match

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  2. Select the incorrect statement.

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  3. Silicones are water repelling in nature due to.

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  4. The colour developed when Na(2)S is added to Na(2)[Fe(CN)(5)NO] is,

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  5. An aqueous solution of glucose boils at 100.04^(@)C.The molal elevatio...

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  6. Which of the following interfaces cannot be obtained ?

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  7. Which of the following statement is true?

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  8. CH(3)-CH(2)-OH In the given reaction A & B are respectively:

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  9. Which destroy antigens?

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  10. Rate of S(N)1 & S(N)2 reactions for the isomers of C(4)H(9)Br is i....

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  11. Chloroquine is:

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  12. The osmotic pressure of a dilute solution is given by

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  13. 3 gms of urea is dissolved in 45 gms of H2O. The relative lowering in ...

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  14. An aqueous solution of glucose boils at 100.05^(@)C.The molal elevatio...

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  15. CH(3)-underset(CH(3)) underset(|) (C)= CH(2) underset("Peroxide") over...

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  16. In which of the following reaction CH(4) will be obtained? i. CH(3)-...

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  17. If Pa and Pb are 108 and 36 torr respectively. What will be the mole f...

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  18. In Mond's process following chemcial changes occurs: underset(("Impu...

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  19. Na(2)[PtBrClI](CN)] No of geometrical isomers =x No of optical iso...

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  20. How many of the following gases/vapours are colourless? CO(2),SO(2),...

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