Question 09
Which of the following aqueous solutions should have the highest boiling point?
(a) 1.0 M NaOH (b) $1.0 M N a_{2} S O_{4}$
(C) $1.0 M N H_{4} N O_{3}$ (d) $1.0 M K N O_{3}$

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Solution

(b) As we know greater the value of van't Holf fctor higher will be the elevation in boiling point and hence higher will be the boiling point of solution.
$\begin{matrix} S o l u t i o n & v a n^{'} t H o f f f a c t o r (i) 1.0 M N a O H & 2 1.0 M N a_{2} S O_{4} & 3 1.0 M N H_{4} N O_{3} & 2 1.0 M K N O_{3} & 2 \end{matrix}$
Hence, $1.0 M N a_{2} S O_{4}$ has highest value of boiling point.

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