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Q.

Insulin is dissolved a suitable solvent and the osmotic pressure of(π) solutions of various concentration C (g/cc) is measured at 20°C . The slope of a plot of π against C is 4.65×10-3. Molecular weight of insulin is

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a

3×105

b

4.8 ×105

c

5.23×105

d

9×105

answer is D.

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Detailed Solution

π=CRT

=nv=RT=wAWAv×RT=wAvRTmA

∴π=RTmAwv

y = mix +   C , here C = 0

Given m=4.64×10-3

⇒RTmA=4.65×10-3

⇒mA=0.0821×2934.65×10-3

=5.17×103

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