Which solution has the highest boiling point temperature ?

0.1 M MgCl

_{2}

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0.1 M HClO

_{4}

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0.1 M KCl

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0.1 M KOH

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0.1 M LiNO

_{3}

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Solution

The correct option is B 0.1 M MgCl $_{2}$
0.1 M $M g C l_{2}$ solution has the highest boiling point.
Elevation in the boiling point is a colligative property and depends on the number of solute particles.
1 mole of $M g C l_{2}$ on dissociation in water gives 3 moles of ions.
$M g C l_{2} \to M g^{2 +} + 2 C l^{-}$
This is maximum number of particles as compared to other solutes.
This results in maximum elevation in the boiling point for the solution and highest boiling point.
Note: 1 mole each of $H C l O_{4}, N H_{4} O H, K O H$ and $L i N O_{3}$ on dissociation in water gives 2 moles of ions.

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K C l

100^{o} C

p H = p K a

(1) 100 m l

0.1 M C H_{3} C O O H + 100 m l

0.1 M C H_{3} C O O N a

(2) 100 m l

0.1 M C H_{3} C O O H + 50 m l

0.1 M N a O H

(3) 100 m l

0.1 M C H_{3} C O O H + 100 m l

0.1 M N a O H

(4) 100 m l

0.1 M C H_{3} C O O H + 100 m l

0.1 M N H_{3}

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