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

A

`0.0372 "K" `

B

`0.0558 "K" `

C

`0.0744 "K" `

D

`0.0186 "K" `

Text Solution

Verified by Experts

The correct Answer is:
B
Vant Hoff.s factor (i) for `Na_(2)SO_(4)=3`
`:. DeltaT_(f)= iK_(f)m=3xx1.86 xx (0.01)/(1)=0.0558K`
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