When 20g of Naphthoic acid (C₁₁H₈O₂) is dissolved in 50g of Benzene (${\mathrm{k}}_{\mathrm{f}}=1.72\mathrm{kg}{\mathrm{mol}}^{-1}$), a freezing point depression of 2 K is observed. The Vant-Hoff’s factor (i) is

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