The Van't Hoff factor will be highest for

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(C) The Van't Hoff factor $(i)$ is equal to the number of ions produced upon dissociation of the solute in the solution.$A$. $NaCl \rightarrow Na^+ +

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$Sodium \ phosphate$

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(C) The Van't Hoff factor $(i)$ is equal to the number of ions produced upon dissociation of the solute in the solution.$A$. $NaCl \rightarrow Na^+ + Cl^-$ $(i = 2)$$B$. $MgCl_2 \rightarrow Mg^{2+} + 2Cl^-$ $(i = 3)$$C$. $Na_3PO_4 \rightarrow 3Na^+ + PO_4^{3-}$ $(i = 4)$$D$. $Urea$ $(NH_2CONH_2)$ is a non-electrolyte,so $i = 1$.Since $Na_3PO_4$ produces the maximum number of ions $(4)$,it has the highest Van't Hoff factor.

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