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Standard XII
Chemistry
Molecular Weight of Polymers
PDI for natur...
Question
PDI for natural polymers is generally close to:
A
zero
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B
1
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C
10
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D
100
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Solution
The correct option is
C
1
PDI abbreviates as polydispersity index of polymer.
P
D
I
=
¯
M
w
M
n
For natural polymers,
P
D
I
=
1
and for synthesis polymers,
P
D
I
>
1
.
Hence, option B is correct.
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Similar questions
Q.
For natural polymers, PDI is generally ___
Q.
(1) : For natural polymers, PDI value is always equal to unity.
(2) : The ratio of
¯
M
w
and
¯
M
n
of a polymer is called PDI.
Q.
The PDI (polydisersity index) is the ratio of weight to number-average molecular masses,
M
¯
w
/
M
¯
n
. In natural polymers, which are generally monodispersed, PDI is ............. and in synthetic polymers which are always polydispersed, PDI is ............. because
M
¯
w
is always ............. than
M
¯
n
. Fill in the blanks.
Q.
The number average molecular mass and mass average molecular mass of a polymer are
30
,
000
and
40
,
000
respectively
. The PDI of the polymer is
Q.
The number average molar mass and mass average molar mass of a polymer are respectively
30
,
000
and
40
,
000
. The polydispersity index (PDI) of the polymer is:
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