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The freezing point of 1 molal NaCl solut...

The freezing point of `1` molal `NaCl` solution assuming `NaCl` to be `100%` dissociated in water is (Molal depression constant of water=1.86Kkg/mol)

A

`-1.86^(@)C`

B

`-3.72^(@)C`

C

`+1.86^(@)C`

D

`+3.72^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaT_(f)=1.86 xx 1 xx 2 = 3.72`,
`:.T_(f)=0-3.72 =-3.72^(@)C`
`NaCl` dissociates to give experimental molality `=1 xx 2 =2`
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