Question

At ${25}^{o}C$. the highest osmotic pressure is exhibited by 0.1 M solution of:

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

Answer 1

The correct option is C $CaC{I}_2$

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.