Question

11 solution having osmotic pressure nearer to that of an equimolar solution of $K_4\left[Fe\right(CN{)}_6]$ is:

• A. $N{a}_{2}S{O}_4$
• B. $BaC{I}_2$
• C. $A{I}_2(S{O}_4{)}_3$
• D. $C_{I2}{H}_{22}{O}_{11}$

Answer 1

The correct option is C $A{I}_2(S{O}_4{)}_3$

For electrolyte, $i=n$

where $i$=Vant Hoff factor and $n$=number of ions present in the electrolyte

For $K_4\left[Fe\right(CN{)}_6]$, $i=n=5$ $[\because 4K^{+}$ ions and $1\left[Fe\right(CN{)}_6{]}^{4-}$ ion$]$

For $A{l}_2(S{O}_4{)}_3$, $i=n=5$ $[\because 2A{l}^{3+}$ ions and $3(S{O}_4{)}^{2-}$ ions$]$

Therefore, the osmotic pressure will be same for both the equimolar solutions.