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Q.

Osmotic pressure of urea solution is 56.6 mm Hg at a temperature of 10° C. The solution is diluted, and the temperature is raised to 40° C such that the osmotic pressure is found to be 31.3 mm Hg. The extent of dilution will be :

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a

Vfinal =10Vinitial 

b

Vfinal =2Vinitial 

c

2Vfinal =3Vinitial 

d

Vfinal =20Vinitial 

answer is B.

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Detailed Solution

π1C1T1=π2C2T2 56.6C1×283=31.0C2×313 C1=2C2

Hence, volume must have doubled.

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