What is the van't Hoff factor of Ferric Sulphate (Assume $100 \%$ ionization)

What is the van't Hoff factor of Ferric Sulphate (Assume $100 \%$ ionization)
  1. $2$
  2. $4$
  3. $5$
  4. $3$

Solution

Ferric sulphate $=\mathrm{Fe}_2\left(\mathrm{SO}_4ight)_3$ $\mathrm{Fe}_2\left(\mathrm{SO}_4ight)_3 ightarrow 2 \mathrm{Fe}^{3+}+3 \mathrm{SO}_4{ }^{2-}$ (complete ionization) $\Rightarrow \quad$ van't Hoff factor $=i=2+3=5$.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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