The relative decrease in `VP` of an aqueous glucose dilute solution is found to be `0.018`. Hence, the elevation in boiling point is (it is given `1 molal` aqueous urea solution boils at `100.54^@)C` at `1 atm` pressure)

Options

A. `0.018^(@)`
B. `0.18^(@)`
C. `0.54^(@)`
D. `0.03^(@)`

Answer

C

Explanation

`chi_(B)=(DeltaP)/P_(A)^(@)=0.018`
`DeltaT_(b)=K_(b).m rArr 0.54=K_(b) = xx1=K_(b)=0.54`
`m=chi_(B)/(1-chi_(B))xx1000/(Mw_(A))`
`m=0.018/0.982xx1000/18=1.0 rArr DeltaT_(b) = K_(b) xx m=0.54^(@)C`