Which of the following aqueous solutions will have the boiling point ${102.2}^{o} C$ ?
The molal elevation constant for water is $2.2 K k g {m o l}^{- 1}$ .

1 m {C H}_{3} C O O H

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1 m

N a C l

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1 M

N a C l

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1 m

G l u c o s e

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Solution

The correct option is C $1 m$ $G l u c o s e$
We know that elevation in boiling point is given by,
$Δ T_{b} = i K_{b} m$
$= i \times 2.2 \times m$

$Δ T_{b} = 102.2 - 100 = {2.2}^{o} C$
Comparing above equations-
$i = 1, m = 1$
Only possible for $1 m$ Glucose solution.
Option D is correct.

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