Q12 of 26 Page 1

Write the names and structures of the monomers of the following polymers:

(i) Terylene


(ii) Bakelite


(iii) Buna-S


(i)Terylene is formed by reaction between ethylene glycol and


Terephthalic acid losing water molecles. This is an examole of condensation polymers.



(ii) On heating formaldehyde with Novalc undergoes cross linked polymers called Bakelite.



(iii)Buna-S is a copolymer made by addition of 1,3-butadiene and styrene.



More from this chapter

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10

Why do transition elements show variable oxidation states? In 3d series (Sc to Zn), which element shows the maximum number of oxidation states and why?

 11

Calculate the mass of Nacl (molar mass = 58.5 g mol-1) to be dissolved in 37.2g of water to lower the freezing point by 20C, assuming that NaCl undergoes complete dissociation. (Kf for water = 1.86 K kg mol-1).

 13

(i) Which one of the following is a monosaccharide:

Starch, maltose, fructose, cellulose


(ii) What is the difference between acidic amino acids and basic amino acids?


(iii) Write the name of the vitamin whose deficiency causes bleeding of gums.


 14

(i) Indicate the principle behind the method used for the refining of Nickel.

(ii) What is then role of dilute NaCN in extraction of Gold?


(iii) What is ‘copper matte’?