Solutions Question 69

Question: A solution of urea (mol.mass56gmol−1) boils at 100.18°C at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512Kkgmol−1 respectively the above solution will freeze at [CBSE PMT 2005]

Options:

A) ,−6.54∘C

B) 6.54∘C

C) 0.654∘C

D) −0.654∘C

Show Answer

Answer:

Correct Answer: D

Solution:

ΔTb=0.18 ; ΔTb=mKb

0.18ΔTf=mKbm,Kf ; 0.18×1.860.512=ΔTf ; ΔTf=0.653

T0−Ts=0.653 ; T0−Ts=0.653 ; Ts=0−0.653oC .

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