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KBr is 80 % dissociated in solution. The...

KBr is 80 % dissociated in solution. The freezing point of a 0.5 molal solution is `(K_(f) "water" = 1.86^(@)C/m)`

A

273 K

B

277 K

C

271.326 K

D

269 K

Text Solution

Verified by Experts

The correct Answer is:
C
For KBr,`i = 1 + alpha = 1 + 0.80 = 1.80`
`Delta T_(f) = i K_(f) m = 1.80 xx 1.86 xx 0.5 = 1.674^(@)`
`T_(f) = 273 - 1.674 = 271.326 K.`
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