Neco 2025 Chemistry Question 17
Practice objective / multiple choice question 17 from the 2025 Neco Chemistry examination.
A step‑growth polymer is formed from equimolar amounts of monomers A (molar mass \(M_A = 120\ \text{g mol}^{-1}\)) and B (\(M_B = 180\ \text{g mol}^{-1}\)). After polymerization the number‑average degree of polymerization is 50. The polymer is then partially depolymerized so that the number‑average molecular weight decreases by 20 % while the weight‑average molecular weight decreases by 10 %. Calculate the new polydispersity index (PDI) of the polymer.
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About This Question
This is Neco 2025 Chemistry Question 17. It is one of the objective questions from the 2025 Neco Chemistry examination.
Difficulty level: Hard .
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