Molar mass of Na₂SO₄ dissolved in water is determined from depression of freezing point experiment. Molar mass of Na₂SO₄ observed can never be

Na₂SO₄ in water undergoes dissociation.

$\therefore$ i  ranges from 1 to 3

i.e., i > 1

$$\begin{gathered} \mathrm{i}=\frac{{\mathrm{M}}_{\mathrm{normal}}}{{\mathrm{M}}_{\mathrm{abnormal}}} \\ {\mathrm{M}}_{\mathrm{abnormal}}=\frac{{\mathrm{M}}_{\mathrm{normal}}}{\mathrm{i}} \\ \because \mathrm{i} \mathrm{is} \mathrm{greater} \mathrm{than} 1, \\ {\mathrm{M}}_{\mathrm{abnormal} } \mathrm{can} \mathrm{never} \mathrm{be} \mathrm{greater} \mathrm{than} {\mathrm{M}}_{\mathrm{normal} }\left(142\right) \end{gathered}$$