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Follwing are equimolal aqueous solution:...

Follwing are equimolal aqueous solution:
a.`1 m urea` , b.`1 m KCl` , c.`1 m MgCl_(2)` , d.`1 m Na_(3)PO_(4)`
Arrange them in increaseing
i. Boiling point , ii.Freezing point , iii. Osmotic pressure , iv.Vapour pressure

Text Solution

Verified by Experts

While analysing the colligative properties, if the density of the solution is not given, take the molarity of the solution same as molality and vice-versa.
In such type of questions, always assume `100%` dissociation for the ionic solutes until and unless specified

i. Boiling point of solution
`T_(b)=T_(b)(@)+(DeltaT_(b))`
`DeltaT_(b)=i(K_(b)m)`
Thus, greater the value of `i`, greater the value of `DeltaT_(b)` , and boiling point of solution.
`altblt cltd`
ii. Freezing point of solution
`T_(f)=T_(f)(@)-(DeltaT_(f))`
`DeltaT_(f)=i(K_(f)m)`
Thus, greater the value of `i`, greater the value of `DeltaT_(f)` , but smaller the value of freezing point.
`dltcltblta`
iii. Osmotic pressure `(pi)`
`(pi)=iCRT`
Thus, greater the value of i, larger the value of osmotic pressure.
`altblt cltd`
iv. Vapour pressure of solution
`DeltaP/P_(A)^(@)=ichi_(B)`
or `DeltaP/P_(A)^(@)=i n_(B)/(n_(A)+n_(B)) ~~n_(B)/n_(A)`
Thus, greater the value of `i`,greater the value of `DeltaP`. Hence , smaller the value of vapour pressure of solution.
`dltcltblta`
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