Which among the following will show maximum osmotic pressure?

Which among the following will show maximum osmotic pressure?
  1. $1 \mathrm{MNaCl}$
  2. $1 \mathrm{M} \mathrm{MgCl}_{2}$
  3. $1 \mathrm{M}\left(\mathrm{NH}_{4}ight)_{3} \mathrm{PO}_{4}$
  4. $1 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4}$

Solution

Vant Hoff factor $i=4$ in case of $\left(\mathrm{NH}_{4}ight)_{3} \mathrm{PO}_{4}$,
$\left(\mathrm{NH}_{4}ight)_{3} \mathrm{PO}_{4} ightleftharpoons 3 \mathrm{NH}_{4}^{+}+\mathrm{PO}_{4}^{3-}$ ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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