The osmotic pressures of 0.010 M solutions of KI and of sucrose (C₁₂H₂₂O₁₁) are 0.432 atm and 0.24 atm respectively. The van't Hoff factor for KI is :

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1.80

0.80

1.2

1.0

answer is A.

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Detailed Solution

$\begin{array}{l} i = \frac{Number of particles in KI solution}{Number of particles in sucrose solution} \\ \Rightarrow \frac{π (KI solution)}{π (sucrose solution)} = \frac{0 .432 atm}{0 .24 atm} = 1 .80 \end{array}$

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