Q21 / 160 · AP EAMCET 2023 (15 May Shift 2) · Chemistry

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

A
$2$
B
$4$
Correct answer
C
$5$
D
$3$

Solution

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

Hence, the correct answer is option: 'C'.

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