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The molal depreesion constant of water i...

The molal depreesion constant of water is `1.86^(@)C//m`. Then find out the freezing point of 0.1 m NaCl solution.

A

`-1.86^(@)C`

B

`0.372^(@)C`

C

`-0.372^(@)C`

D

`-0.186^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
C
For NaCl, i = 2
`Delta T_(f)=2K_(f).m`
`= 2xx1.86xx0.1=0.372`
`T_(s)=T-Delta T_(f)=0-0.372=-0.372^(@)C`.
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