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  4. At 25°C, the highest osmotic pressure is exhibited by 0.1 M solution of

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Q. At 25$^\circ$C, the highest osmotic pressure is exhibited by 0.1 M solution of

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Solution:

In solution, $CaCl _{2} \longrightarrow Ca ^{2+}+2 Cl ^{-}$i.e, it gives $3$ ions.
$KCl \longrightarrow K ^{+}+ Cl ^{-}$, it gives $2$ ions.
Glucose & urea are covalent molecules & do not undergo ionisation.
Since, osmotic pressure is a colligative property & depends upon the number of solute particles $0.1\, M$
$CaCl _{2}$ exhibits highest osmotic pressure.