The solution having highest vapour pressure is :(Assume 100% ionisation of electrolytes)

Options

A. `1N KNO_(3)`
B. `1N Ba(NO_(3))_(2)`
C. `1N Al_(2)(SO_(4))_(3)`
D. `1N Th(NO_(3))_(4)`

Answer

C

Explanation

`1N KNO_(3)= 1M KNO_(3)= 1 xx 2= 2`
`1N Ba(NO_(3))_(2) = (1)/(2) M Ba(NO_(3))_(2)= (1)/(2) xx 3= 1.5`
`1N Al_(2) (SO_(4))_(3)= (1)/(6) M Al_(2) (SO_(4))_(3)= (1)/(6) xx 5= 0.83`
`1N Th (NO_(3))_(4) = (1)/(4) M Th (NO_(3))_(4) = (1)/(4) xx 5= 1.25`
Thus, more is the No of particles furnished more will be lowering or minimum will be V.P