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Q.

The osmotic pressure of the solution obtained by mixing 200cm3 of 2% (mass-volume) solution of urea with 200cm3 of 3.42% solution of sucrose at 20°C is

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a

1.2 bar

b

15.4 bar

c

5.2 bar

d

4 bar

answer is C.

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Detailed Solution

2% urea of 200c cm3+3.42% sucroce of 200 cm3

n1=460,n2=3.42342×2

= 0.066         = 0.02

n=n1+n2

= 0.086

n=0.086400×1000×0.0821×293

= 5.2 bar

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