Q136 · CSIR-NET Chemistry, June 2011

Paper: CSIR-NET June 2011 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymer Chemistry – General · Marks: 2 · Difficulty: Medium

There are several types of mean molar masses for polymer and they are dependent on experimental methods like: (1) Osmometry (2) Light scattering (3) Sedimentation. Correct relation between mean molar masses and experimental method is:
(a)$\overline{\mathrm{M}}_{\mathrm{n}} \Rightarrow(3), \overline{\mathrm{M}}_{\mathrm{w}} \Rightarrow(2), \overline{\mathrm{M}}_{\mathrm{z}} \Rightarrow(1)$
(b)$\overline{\mathrm{M}}_{\mathrm{n}} \Rightarrow(2), \overline{\mathrm{M}}_{\mathrm{w}} \Rightarrow(3), \overline{\mathrm{M}}_{\mathrm{z}} \Rightarrow(1)$
(c)$\overline{\mathrm{M}}_{\mathrm{n}} \Rightarrow(1), \overline{\mathrm{M}}_{\mathrm{w}} \Rightarrow(2), \overline{\mathrm{M}}_{\mathrm{z}} \Rightarrow(3)$
(d)$\overline{\mathrm{M}}_{\mathrm{n}} \Rightarrow(1), \overline{\mathrm{M}}_{\mathrm{w}} \Rightarrow(3), \overline{\mathrm{M}}_{\mathrm{z}} \Rightarrow(2)$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Osmometry gives M̄ₙ, light scattering gives M̄w, and sedimentation equilibrium gives M̄z (c).

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