AP EAMCET · Chemistry · Polymers
The polydispersity index of a polymer containing 10 molecules with molecular mass \(1.0 \times 10^4\) and 10 molecules with molecular mass \(1.0 \times 10^5\) is approximately.
- A 1.67
- B 0.59
- C 1.55
- D 0.83
Answer & Solution
Correct Answer
(A) 1.67
Step-by-step Solution
Detailed explanation
The PDI (polydispersity index) \(=\frac{M_w}{M_n}=1.67\) \(M_w=\) Weight average molecular weight. \(M_n=\) Number average molecular weight. \[ \begin{aligned} & M_n=\frac{N_1 M_1+N_2 M_2}{N_1+N_2}=55,000 \\ & M_w=\frac{N_1 M_1^2+N_2 M_2^2}{N_1 M_1+N_2 M_2}=91818 \end{aligned} \]
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- In general, for soaps, the concentration of surfactant at CMC is around \(\mathrm{mol} \mathrm{L}^{-1}\).AP EAMCET 2021 Easy
- What are \(X, Y\) and \(Z\) in the following reaction?
AP EAMCET 2018 Medium - The order of basic strength of methyl substituted amines and \(\mathrm{NH}_3\) in aqueous solution isAP EAMCET 2018 Hard
- The conjugate base of \(\mathrm{NH}_3\) isAP EAMCET 2022 Easy
- At 298 K, the following reaction takes place for a cell at the hydrogen electrode
\(\mathrm{H}^{+}(\mathrm{aq})+\mathrm{e}^{-} \longrightarrow \frac{1}{2} \mathrm{H}_2(1\) bar \()\)
The solution pH is 10.0. What is the hydrogen electrode potential in volts ?
\(\left(\frac{2.303 \mathrm{RT}}{\mathrm{~F}}=0.06 \mathrm{~V}\right)\)AP EAMCET 2025 Medium - Which of the following sequence of reagents convert 3-hexene to propane?AP EAMCET 2024 Easy
More PYQs from AP EAMCET
- In a class consisting of 40 boys and 30 girls. \(30 \%\) of the boys and \(40 \%\) of the girls are good at Mathematics. If a student selected at random from that class is found to be a girl, then the probability that she is not good at Mathematics isAP EAMCET 2024 Medium
- If \(\int \frac{d x}{(x-1)^{3 / 2}(x-3)^{1 / 2}}=\sqrt{f(x)}+c\) then \(f(-1)-f(0)=\)AP EAMCET 2025 Medium
- \(A=\left[\begin{array}{lll}0 & 1 & 2 \\ 2 & 3 & 0 \\ 4 & 0 & 3\end{array}\right]\) and \(B\) is a matrix such that \(A B=B A\). If
\(A B\) is not an identity matrix, then the matrix that can be taken as B isAP EAMCET 2024 Easy - The dominant intermolecular force that must be overcome to convert liquid methanol to its vapour isAP EAMCET 2021 Easy
- Identify the correct statements from the following
I) Sulphur sol is an example for multi molecular colloid.
II) Starch sol is an example for associated colloid.
III) Artificial rubber is an example for macromolecular colloid.AP EAMCET 2025 Medium - If \(\frac{3 x+2}{(x+1)\left(2 x^2+3\right)}=\frac{A}{x+1}+\frac{B x+C}{2 x^2+3}\), then \(A+C-B\) is equal to :AP EAMCET 2006 Easy