Identify the four groups into which the polymers are classified on the basis of the magnitude of intermolecular forces present in them.

Potassium sulphate → Ionic solid  Tin → Metallic solid  Benzene → Molecular (non-polar) solid  Urea → Polar molecular solid  Ammonia → Polar molecular solid  Water → Hydrogen bonded molecular solid Zinc sulphide → Ionic solid  Graphite...

Different types of polymers have different intermolecular forces of attraction. Elastomers or rubbers have the weakest while fibres have the strongest intermolecular forces of attraction. Plastics have intermediate intermolecular forces...

Jobber...................

(b) Let Seema’s present age be x years.  Then, Seema’s son’s present age = x/4 years  Seema’s father’s present age = 7x/4 years.  Then, x+ x/4 +7x/4= 32x3  12x = 96 × 4  x = 96...

(i) Polythene, PVC. (ii) Nylon 6, Nylon 6,6. (iii) Buna-S, Buna-N.

 Intermolecular Forces: The forces of attractions and repulsion between interacting particles.

(a) noble gases.  (b) between HCl molecules.  (c) Between water molecules or HF molecules.  (d)Between NO3 - and water molecules

(i) Sublimation of iodine : Dispersion forces. (ii) Evaporation of water : Hydrogen bond.

(a) Dipole-Dipole interactions. (b) H-Bond. (c) Dispersion forces. (d) Dispersion forces. (e) Dispersion forces. (f) Induced dipole-dipole interactions.

A will have stronger interparticle forces as it can be liquefied at a higher temperature.