Question

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

• A. $CaC{l}_2$
• B. KCl
• C. glucose
• D. urea

Answer 1

Answer: (A)

In solution, $CaC{l}_2⟶C{a}^{2+}+2C{l}^{-}$i.e, it gives $3$ ions.
$KCl⟶K^{+}+C{l}^{-}$, 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 $0.1M$
$CaC{l}_2$ exhibits highest osmotic pressure.