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If bar(M)(w) is the weight -average mole...

If `bar(M)_(w)` is the weight -average molecular weight and `bar(M)_(n)` is the number -average molecular weight of polymer, the poly dispersity index (PDI) of the polymer is given by

A

`(bar(M)_(n))/(bar(M)_(w))`

B

`(bar(M)_(w))/(bar(M)_(n))`

C

`bar(M)_(w) xx bar(M)_(n)`

D

`(1)/(bar(M)_(w) xx bar(M)_(n))`

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-POLYMERS-OBJECTIVE EXERCISE - 4
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  2. (A) Glyptal is a condensation homo polymer. (R) Glyptal is used to p...

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

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  4. (A): F(2)C=CF(2), is the monomer of teflon. (R): Polytetrafluoroethy...

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  5. (A): The chains of nylon-6, 6 are held by hydrogen bonding forces. (...

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  6. (A) : Natural rubber and gutta percha are examples of cis-trans isomer...

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  7. (A): Styrene is more reactive than propylene towards cationic polymeri...

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  8. (A) Nylon-6 is obtained by polymerization of caprolactam. (R) Nylon-...

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  9. (A) P.V.C is an addition copolymer (R) P.V.C is used to prepare hand...

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  10. (A) Vulcanised rubber is stiff and has little tendency to absorb water...

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  11. (A) Natural rubber is cis polyisoprene. (R) Isoprene is 2-methyl-1,3...

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  12. (A) Thermosetting polymers are cross linked polymers. (R) Thermosett...

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  13. (A) Natural rubber is an elastomer. (R) The intermolecular forces of...

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  14. (A) Bakelite is prepared by copolymerisation of formaldehyde and pheno...

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  15. (A) Cellulose is natural polymer. (R) Cellulose is obtained from pla...

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  16. (A) Cellulose acetate is a semisynthetic polymer. (R) Natural polyme...

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  17. (A) Poly vinyl chloride is a linear polymer. (R) Poly vinyl chloride...

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  18. (A) L.D.P.E is a branched polymer. (R) L.D.P.E is inert tough and fl...

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  19. (A) Bakelite is a cross linked polymer. (R) Bakelite is formed from...

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  20. (A) Benzene does not undergo polymerisation. (R) Benzene loses aroma...

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  21. (A) Ethylene can undergo polymerisation. (R) Ethylene contain a weak...

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