Question

For which of the following van't Hoff factor cannot be greater than unity?

• A. $K_{4}\left[\right. Fe \left(\right. CN \left.\right)_{6} \left]\right.$
• B. $AlCl_{3}$
• C. $H_{2}NCONH_{2}$
• D. $KNO_{3}$

Answer 1

Answer: (C)

For urea the van't Hoff factor can not be greater than unity because urea is non-ionisable (non-electrolyte) while others are ionic compounds so will undergo dissociation in aqueous solution so, van't Hoff factor will become more than unity.