Q26 of 50 Page 1

Draw the structures of the monomers of the following polymers:

(i) Polythene


(ii) PVC


(iii) Teflon


(i) Polythene is the polymer formed by the addition polymerization of ethene. There are two types of polythenes namely- High density polythene(HDP) and Low density polythene(LDP).



Structure of monomer – Ethene.



(ii) When multiple molecules of vinyl chloride ( is heated in an inert solvent in the presence of dibenzoyl peroxide then PVC is obtained.



Structure of monomer – Vinyl chloride.



(iii) Teflon is prepared by the polymerization of Tetrafluoroethene(PTFE) molecules. It is done so by heating PTFE molecules under high pressure and in presence of ammonium peroxo sulphate [(



Tetrafluoroethene Teflon


Structure of monomer – Tetrafloroethene



More from this chapter

All 50 →
24

How would you obtain the following:

(i) Benzoquinone from phenol


(ii)2-Methylpropan-2-ol from methylmagnesium bromide


(iii)Propan-2-ol from propene


 25

State reasons for the following:

(i) pKb value for aniline is more than that for methylamine.


(ii) Ethylamine is soluble in water whereas aniline is not soluble in water.


(iii) Primary amines have higher boiling points than tertiary amines.


 27

What are the following substances? Give one example of each.

(i) Food preservatives


(ii) Synthetic detergents


(iii) Antacids


 28

(a) What type of a battery is lead storage battery? Write the anode and cathode reactions and the overall cell reaction occurring in the operation of a lead storage battery.

(b) Calculate the potential for half-cell containing 0.10 M K2Cr2O7 (aq), 0.20 M Cr3+ (aq) and 1.0 x 10-4 M H+ (aq) The half-cell reaction is and the standard electrode potential is given as E° = 1.33 V


OR


(a) How many moles of mercury will be produced by electrolyzing 1.0 M Hg(NO3)2 solution with a current of 2.00 A for 3 hours? [Hg(NO3)2 = 200.6 g mol–1]


(b) A voltaic cell is set up at 25°C with the following half-cells Al3+ (0.001 M) and Ni2+ (0.50 M). Write an equation for the reaction that occurs when the cell generates an electric current and determine the cell potential.
(Given: E0Ni2+| Ni = -0.25V, E0Al3+|Al = -1.66V) [5]