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ChemistryLiquid SolutionAbnormal Colligatiove PropertiesEasy2 minPYQ_2020
ChemistryEasysingle choice

For a dilute solution containing 2.5 g of a non-volatile non–electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is 2 o C . Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (in mm of Hg) of the solution is (take K b =0.76 Kkg  mol −1 )

Options:

Answer:
C
Solution:

ΔTf=iKfm(i=1for non-electrolyte)
2=0.76×n1001000
n=27.6
Relative lowering in vapour pressure=XB(mole fraction of solute)
ΔPPA0=2/7.6100/18
ΔP760=36760
ΔP=36
P=760-36
P=724 mm of Hg

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:Liquid SolutionSubtopic:Abnormal Colligatiove Properties
⏱ 2mℹ️ Source: PYQ_2020

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