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KBr is 80% dissociated in aqueous soluti...

KBr is 80% dissociated in aqueous solution of 0.5M concentration (Given `K_(f)` for water `=1.86 K kg mol^(-1)`). The solution freezes at

A

271.326 K

B

272 K

C

270.5 K

D

268.5 K

Text Solution

Verified by Experts

The correct Answer is:
A
`i=1.8 , m=0.5`
`K_(f)=1.86 , DeltaT_(f)=?`
`DeltaT_(f)=iK_(f)xxm`
`=1.8xx1.86xx0.5=1.674`
`T_(f)=273K-1.674K=271.326K`.
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