1.

The obsrved osmotic pressure foe a 0.10 M solution of Fe (NH_(4))_(2) (SO_(4)) _(2) at 25^(@)C is 10.8 atm. The expected and experimental (observed) values of van't Hoff factor (i) will be respectively .

Answer»

5 and `4.42`
`4 and 4.00`
5 and `3.42`
`3 and 5.42`

Solution :GIVEN `PI _(AB)= 10.8` atm
`pi _(nw) =CST =0.10 xx0.0821 xx298 =2.446`
now experimental value of (i)
`= ("Observed osmotic pressure")/("Normal osmotic pressure") = (10.8)/(2.445) =4.42`


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