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Question

# A decimolar solution of potassium ferrocyanide is 50% dissociated at 300K. The osmotic pressure of the solution is:

A
2.4101 atm
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B
1.5420 atm
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C
7.389 atm
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D
10.1281 atm
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Solution

## The correct option is C 7.389 atmWe are given a decimolar solution of K4[Fe(CN)6], molarity = 0.1 M Degree of dissociation (α)=50100=0.5 Potassium ferrocyanide dissociates to give, K4[Fe(CN)6]→4K++[Fe(CN)6]4− Hence n = 5 α=i−1n−1 0.5=i−15−1 i−1=2 ∴i=3 ∴ van't Hoff factor is 3 π=i×c×R×T π=3×0.1×0.0821×300 =7.389 atm

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