alleryThe boiling point elevation $\Delta T_b$ of a dilute solution is:
ADirectly proportional to molality
BIndependent of molality
CProportional to mole fraction of solvent
DInversely proportional to molality
Answer & Solution
Correct answer: A. Directly proportional to molality
$\Delta T_b = K_b m$, directly proportional to molality $m$.
$K_b$ is the ebullioscopic (molal elevation) constant — the BP elevation produced by a 1 molal solution.
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