InterviewSolution
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InterviewSolution
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A solution of urea (mol. mass 60g `mol^(-1)`) boils at `100.18^(@)C` at the atmospheric pressure. If `K_(f)` and `K_(b)` for water are 1.86 and `0.512 kg mol^(-1)` respectively the above solution will freeze atA. `-6.54^(@)C`B. `6.54^(@)C`C. `0.654^(@)C`D. `-0.654^(@)C` |
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Answer» Correct Answer - D `Delta T_(b)=0.18 , Delta T_(b)=m K_(b)` `(0.18)/(Delta T_(f))=(mK_(b))/(m K_(f)) , (0.18xx1.86)/(0.512)=Delta T_(f) , Delta T_(f)=0.653` `T^(+)-T_(s)=0.653 , T_(s)=0-0.653^(@)C , T_(s)=-0.653^(@)C` |
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