Question

52. An aqueous solution containing lg of urea boils at
100.25 °C. The aqueous solution containing 3g of
glucose in the same volume will boil at -
(1) 100.75 °C
(2) 100.5 °C
(3) 100 °C
(4) 100.25 °C​

Answer 1

Explanation:

Solution :

ΔTb=Kb×1000×WBWA×MB∣∣, Since Kb| and WA| are same for two solutions, ΔTbΔTb=WB×M′BW′B×MB∣∣

ΔTb(Urea)−0.25∘,WB−1g,MB−60|ΔT′b(Glucose)−?,W′B−3g,M′B=180

0.25ΔT′b=1×1803×60∣∣ΔTb−0.25∘C|

Boiling point of solution =100+0.25=100.25?C (Solutions of non- electrolyte having same concentrations will boil at same temperature )