CBSE Class 12 Chemistry 2022 Term 1 Paper

Question : 35 of 55

Marks: +1, -0

The boiling point of a

0.2 {\m}

solution of a nonelectrolyte in water is

( {\K}_{ {\b}}.

for water

=0.52 {\K} {\kg}

{\mol}^{-1}

)

Solution:

Molality of solution

=0.2 {\m}

K_b

of water

=0.52 {\K} {\kg} {\mol}^{-1}

Boiling Point Elevation

For most non-electrolytes dissolved in water, the van't Hoff factor is essentially 1 .
Hence, Elevation in Boiling point

=0.52 × 0.2=

0.104 {\C}^{∘}

Therefore,
Boiling point

=100+0.104=100.104 {\C}^{∘}

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