1.

In a 0.2 molal aqueous solution of a week acid HX, the degree of ionisation is 0.3. Taking `K_(F)` for water as 1.85, the freezing point of the solution will be nearest toA. `-0.360^(@)C`B. `-0.260^(@)C`C. `+0.480^(@)C`D. `-0.481^(@)C`

Answer» Correct Answer - d
`{:(,HX, hArr,H^(+),+,X^(-)),("Initially",1 mol,,0,,0),("After dissociation",1-0.3,,0.3,,0.3):}`
Total moles `= 1 - 0.3 + 0.3 + 0.3 = 1.3`
`I = (1.3)/(1) = 1.3`
`DeltaT_(f) = iK_(f)M = 1.3xx1.85xx0.2 = 0.481^(@)C`


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