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Question

Two solutions of glucose, 1st and 2nd have osmotic pressure 1.5 atm and 2.5 atm, respectively. 1 litre of 1st solution is mixed with 2 litres of 2nd solution. The osmotic pressure for the resultant solution will be :

A
21.6 atm
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B
0.126 atm
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C
2.16 atm
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D
0.216 atm
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Solution

The correct option is C 2.16 atm
Using π=CRT,
Molarity of 1st solution =1.5RT

Molarity of 2nd solution =2.5RT
Now, effective molarity of the mixture =M1V1+M2V2V1+V2=1.5RT×1+2.5RT×23=6.53RT
Therefore, π=6.53atm=2.16 atm.

Option C is correct.

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