Polythene, PVC are .............

The molecular weight of low density polythene ranges between .......and.....

Fill in the blanks by choosing the appropriate word/words from those given in the brackets : (Natural, synthetic, step-growth, chain-growth, natural rubber, synthetic rubber, melamine, thermo, thermosetting, addition, condensation, hydrogen bonds, van der Waals', 373-573, 543, 100, 10, benzoyl peroxide, acetyl peroxide, amide, butadiene, natrium, dimethyl terephthalate) Polymerization of ethene at .......... K temperature and ......... atomospheric pressure in presence of O_2 forms polythene.

Fill in the blanks by choosing the appropriate word/words from those given in the brackets : (Natural, synthetic, step-growth, chain-growth, natural rubber, synthetic rubber, melamine, thermo, thermosetting, addition, condensation, hydrogen bonds, van der Waals', 373-573, 543, 100, 10, benzoyl peroxide, acetyl peroxide, amide, butadiene, natrium, dimethyl terephthalate) Polythene is an example of ...........polymer.

In the following groups of materials, which group(s) contains only non-biodegradable items ? (i) Wood, paper, leather, (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass, (iv) Plastic, bakelite, DDT

Pick out carcinogens from: Asbestos, Infrared rays, Arsenic, Polythene, Casein, Caffein, Tobacco smoke, Gamma rays.