Among the following, the solution which shows the highest osmotic pressure is

Options

A. `0.04 M FeSO_(4).(NH_(4))_(2)SO_(4).H_(2)O`
B. `0.05 M K_(4)[Fe(CN)_(6)]`
C. `0.05 M k_[Cu(CN)_(4)]`
D. `0.05 M Al(NO_(3))_(3)`

Answer

2

Explanation

`pi=I CRT`
At a given temperature, solution having the highest value of iC has the gighest osmotic pressure.
`K_(4)[Fe(CN)_(6)] rarr 4K^(+)+[Fe(CN)_(6)]^(4-)`
`iC=(5)(0.05)=0.25`
`FeSO_(4). (NH_(4))_(2)SO_(4).6H_(2)Ooverset(H_(2)O)(rarr) Fe^(2+)+2NH_(4)^(+)+2SO_(4)^(2-)`
`iC=(5)(0.04)`
`=0.2`
`K_(3)[Cu(CN)_(4)]overset(H_(2)O)(rarr) 3K^(+)+[Cu(CN)_(4)]^(3-)`
`iC=(4)(0.05)`
`=0.2`
`Al(NO_(3))_(3)overset(H_(2)O)(rarr)Al^(3+)+3NO_(3)^(-)`
`iC=(4)(0.05)`
`=0.2`