Test Index

Solutions Part 1

Section: Chemistry

Question : 95 of 100

Marks: +1, -0

Which one of the following aqueous solutions will exhibit highest boiling point?

[AIEEE 2004]

$0.01\mathrm{M} \; \mathrm{Na}_2\mathrm{SO}_4$
$0.015\mathrm{M}$ glucose
$0.015\mathrm{M}$ urea
$0.01\mathrm{M} \; \mathrm{KNO}_3$

Validate

Solution:

\Delta T_b^b = T_b - T_b^o

Where

T_b = b

. pt of solution

T_b^o = b . p t

of solvent or

T_b = T_b^o + \Delta T_b

NOTE : Elevation in boiling point is a colligative property, which depends upon the no. of particles. Thus greater the number of particles, greater is it elevation and hence greater will be its boiling point.

\mathrm{Na}_2\mathrm{SO}_4 \rightleftharpoons 2\mathrm{Na}^{+} + \mathrm{SO}_4^{2-}

Since

\mathrm{Na}_2\mathrm{SO}_4

has maximum number of particles (3) hence has maximum boiling point.

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