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(A) : Most of the polymeric materials ar...

(A) : Most of the polymeric materials are non biodegradable
(R) : But they have increasing use due to low cost and variable applications

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

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The correct Answer is:
D
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Mostly all polymeric materials are non-bio degradable and as such the discarded plastic materials made out of these polymers reate environmental pollution. The chief among the polluting plastic material is polythene. The use of polythene bags, popularly called carry bags and their discardance in the environment is a singular nuisance for municipal cleaning department Non-biodegradable polymer is/are

Mostly all polymeric materials are non-bio degradable and as such the discarded plastic materials made out of these polymers reate environmental pollution. The chief among the polluting plastic material is polythene. The use of polythene bags, popularly called carry bags and their discardance in the environment is a singular nuisance for municipal cleaning department Most economic and useful substance for the manufacture of carry bags is

Mostly all polymeric materials are non-bio degradable and as such the discarded plastic materials made out of these polymers reate environmental pollution. The chief among the polluting plastic material is polythene. The use of polythene bags, popularly called carry bags and their discardance in the environment is a singular nuisance for municipal cleaning department Which of the following is a bio degradable polymer ?

(A) Dextron is a non biodegradable polymer. (R) Dextron is used in safety helmets.

(A): Graphite is an example of neutral refractory material used in furnaces (R) : Chemically graphite is most stable allotrope of carbon

Four rods A, B, C and D of the same length and material but of different radii r, r sqrt(2),r sqrt(3) and 2r respectively are held between two rigid walls. The temperature of all rods is increased through the same range. If the rods donot bend, then a) The stress in the rods A, B, C and D are in the ratio 1:2:3:4 b) The forces on them exerted by the wall are in the ratio 1:2:3:4 c) The energy stored in the rods are due to elasticity are in the ratio 1:2:3:4 d) The strains produced in the rods are in the ratio 1:2:3:4

Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Which of the following gases will be most easily adsorbed by the charcoal in the gas mask

AAKASH SERIES-POLYMERS-Level - I (Exercise - II) (Assertion (A) & Reason (R) type questions)
  1. (A) : The gross mobility of elastomer chain is its special characteris...

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  2. (A) : Natural rubber is an addition polymer. (R) : Natural rubber ha...

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  3. (A) : Natural rubber is elastic and non-cryslalline. (R) : Weak vand...

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  4. (A) Polypropylene is an addition polymer (R) : Polypropylene is poly...

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  5. (A) : Polybutadiene is an example of chain growth polymer (R) : In c...

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  6. (A) The polymerization of propylene is carried out in presence of SnCl...

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  7. (A) : Most of the polymeric materials are non biodegradable (R) : Bu...

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  8. (A) : Cellulose acetate and cellulose nitrate are used in textiles bec...

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  9. (A) : Styrene is more reactive than propene towards cationic polymeriz...

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  10. (A) : Bakelite is copolymer (R) : Bakelite is a thermosetting materi...

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  11. (A) : Glyptal is obtained by the condensation polymerization of ethyle...

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  12. (A) : Novac is heated in presence of hexamethyl tetramine to form hard...

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  13. (A) : Nylon 6,6 is a fibre. Because (R) : It is an addition polymer

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  14. (A) Nylon - 6,6 is classified as a condensation heteropolymer. (R) :...

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  15. (A) : Bakelite is thermosetting polymer. (R) : Bakelite has three di...

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  16. (A) : Natural rubber is a polymer of cis-isoprene (R) : Poly trans i...

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  17. (A) : The vulcanised rubber has greater elasticity and tensile strengt...

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  18. (A) : Addition of CH(3)COOH and HCOOH electrolytes causes coagulation ...

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  19. (A) : Osmotic pressure method is the most suitable method to determine...

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  20. (A) : Molecular mass of polymers is always expressed as an average (...

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