The elevation of boiling point of a dilute solution is given by which expression, where m is molality and Kb the molal elevation constant?
Adelta Tb = m / Kb
Bdelta Tb = Kb + m
Cdelta Tb = Kb m
Ddelta Tb = Kb / m
Answer & Solution
Correct answer: C. delta Tb = Kb m
1. For dilute solutions, $\Delta T_b$ is directly proportional to molality m.
2. Introducing the proportionality constant Kb gives $\Delta T_b = K_b m$.
3. The relation is a product, not a ratio or a sum.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.16_
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