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  4. For which among the following equimolar aqueous solutions Van’t Hoff factor has the lowest value ?

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Q. For which among the following equimolar aqueous solutions Van’t Hoff factor has the lowest value ?

MHT CETMHT CET 2017Solutions

Solution:

For the aqueous solution of urea, van't Hoff factor has the lowest value.
Urea is non-electrolyte and does not dissociate in aqueous solution.
Hence, Van't Hoff factor is $1$.
For aluminium chloride $AlCl _{3}, i =4$
$AlCl _{3} \rightarrow Al ^{3+}+3 Cl ^{-}$
For potassium sulphate $K _{2} SO _{4}, i =3$
$K _{2} SO _{4} \rightarrow 2 K ^{+}+ SO _{4}^{2-}$