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The freezing point of one molal NaClsolu...

The freezing point of one molal `NaCl`solution assuming `NaCl`to be `100%`dissociated in water is (molal depression constant=`1.86)`

A

`-1.86^(@)C`

B

`-3.72^(@)C`

C

`+1.8^(@)C`

D

`+3.72^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
B
For `NaCl i=2`
`DeltaT_(f)=2K_(f)m=2xx1.86xx1=3.72`
`T_(s)=T=DeltaT_(f)=0.3.72=-72^(@)C`
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