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

K_{3} [F e (C N)_{6}]

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N a C l

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Urea

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N a_{2} S O_{4}

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Solution

The correct option is A $K_{3} [F e (C N)_{6}]$
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 $Δ T = i . K_{b} . m$
Van't Hoff factor for the given solutes are:
$K_{3} [F e (C N)_{6}] : i = 4$
$N a C l : i = 2$
Urea $H_{2} N C O N H_{2} : i = 1$
$N a_{2} S O_{4} : i = 3$
The highest boiling point will be of $K_{3} [F e (C N)_{6}]$ because it has highest Van't Hoff factor, i=4.
option A is correct

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