Engineering Sciences
GATE XE concept:weight-average PYQs
Build your understanding with focused practice from past exam papers.
How to practice concept:weight-average
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–4 of 4. Imported answers require independent review unless marked reviewed.
Question 113
Open questionXE-FMCQ1 markNeeds review
For a polydisperse polymer, the viscosity-average molecular weight (
) becomes equal to the weight-average molecular weight (
), when the Mark–Houwink constant a is _________________.Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 112
Open questionXE-FMCQ1 markNeeds review
A certain polymer synthesised in the laboratory shows that all the chains have same number of repeat units (i.e., same degree of polymerization). The relationship between weight-average (
), number-average (
), and z-average (
) molecular weights for this polymer can be expressed asYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 128
Open questionXE-FNAT2 marksNeeds review
A monodisperse polymer sample of molecular weight 10,000 g mol
is mixed with another monodisperse sample of the same polymer of molecular weight 50,000 g mol
. The total mass of the mixture is 1,000 g and the total number of moles of the polymer in the mixture is 0.04 mol. The weight-average molecular weight (
) of the polymer mixture is ______ g mol
(rounded off to the nearest integer).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 131
Open questionXE-FNAT2 marksNeeds review
The molar mass distribution of a polymer is
Number of molecules | Molar mass (g/mol) |
|---|---|
100 | 750 |
50 | 500 |
The resulting weight average molecular weight of the polymer is ______ g/mol. (Answer in integer)
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