JEE Main 2021 — Solutions Question with Solution
From: JEE Main 2021 (Online) 25th February Evening Shift
Question
If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)
[Kb = 0.52 K kg mol1]
[Kb = 0.52 K kg mol1]
Enter your answer
Show full solutionCorrect answer: 2.74
Correct answer
2.74
Step-by-step explanation
As AB is a binary electrolyte,
AB A+ + B, n = 2
Given, Tb = 2.5 K
Kb = 0.52 K kg mol1
Tb = Kb m i
mol/kg
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