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Question

Which of the following aqueous solution has the highest boiling point having concentration 0.050 m?

A
K3[Fe(CN)6]
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B
NaCl
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C
Urea
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D
Na2SO4
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Solution

The correct option is A K3[Fe(CN)6]
Elevation in boiling point depends on the Van't Hoff factor (i) which is the number of ions produced in the aqueous solution from solute.
as ΔT=i.Kb.m
Van't Hoff factor for the given solutes are:
K3[Fe(CN)6]:i=4
NaCl:i=2
Urea H2NCONH2:i=1
Na2SO4:i=3
The highest boiling point will be of K3[Fe(CN)6] because it has highest Van't Hoff factor, i=4.
option A is correct

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