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If solution sulphate is considered to be...

If solution sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point water `(Delta T_(f))`, when `0.01` mole of solution sulphate is dissolved in `1 kg` of water, is: `(K'_(f) = 1.86 kg mol^(-1))`

A

`0.0372 K`

B

`0.0558 K`

C

`0.0744 K`

D

`0.0744 K`

Text Solution

Verified by Experts

The correct Answer is:
B
Vant Hoff's factor `i` for `Na_(2)SO_(4) = 3`
`:. Delta T_(f) = i xx K'_(f) xx "molality"`
`= 3xx 1.86 xx (0.01)/(1) = 0.0558 K`
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