The correct order of increasing boiling points is:

0.01 M N a N O_{3} < 0.01 M L a (N O_{3})_{3} < 0.01 M M g B r_{2}

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0.01 M N a N O_{3} < 0.01 M M g B r_{2} < 0.01 M L a (N O_{3})_{3}

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0.01 M M g B r_{2} < 0.01 M L a (N O_{3})_{3} < 0.01 M N a N O_{3}

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0.01 M L a (N O_{3})_{3} < 0.01 M M g B r_{2} < 0.01 M N a N O_{3}

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Solution

The correct option is B $0.01 M N a N O_{3} < 0.01 M M g B r_{2} < 0.01 M L a (N O_{3})_{3}$
$Δ T_{b}$ being a colligative property depends upon the number of solute particles, i.e greater the number of ions, larger will be the elevation in boiling point and thus, greater will be the boiling point.
$L a (N O_{3})_{3} ⇌ L a^{3 +} + 3 N O_{3}^{-}; 4 ions$
$M g B r_{2} ⇌ M g^{2 +} + 2 B r^{-}; 3 ions$
$N a N O_{3} ⇌ N a^{+} + N O_{3}^{-}; 2 ions$
$∴$ The correct order of increasing boiling points is:
$0.01 M N a N O_{3} < 0.01 M M g B r_{2} < 0.01 M L a (N O_{3})_{3}$

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