Q14 of 37 Page 1

Write the structures of the monomers used for getting the following polymers :

(i) Nylon-6 (ii) Melamine – formaldehyde polymer (iii) Teflon

Nylon -6


It is manufactured by heating caprolactum with water at a high temperature.



(ii) Melamine – formaldehyde polymer


Melamine formaldehyde polymer is manufactured by the condensation polymerisation of melamine and formaldehyde.



(iii) Teflon


(Polytetrafluoroethene)


Teflon is manufactured by heating tetrafluoroethene with a free radical or persulphate catalyst at high pressures.



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6

Write the reactions involved in the following reactions :

(i) Clemmensen reduction


(ii) Cannizzaro reaction

 8

Define the following terms :

(i) Abnormal molar mass


(ii) van’t Hoff factor – (i)

 10

Complete the following chemical equations:

(i) F2 + 2Cl-→


(ii) 2XeF2 + 2H2O →


OR


What happens when


(i) HCl is added to MnO2


(ii) PCl5 is heated


Write the equations involved.

 19

Write one difference between each of the following :

(i) Multimolecular colloid and Macromolecular colloid


(ii) Sol and Gel


(iii) O/W emulsion and W/O emulsion