JEE Main 2021 — Solutions Question with Solution
From: JEE Main 2021 (Online) 26th February Evening Shift
Question
When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be 0.93C (Kf(H2O) = 1.86 K kg mol1). The number (n) of benzoic acid molecules associated (assuming 100% association) is ___________.
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Show full solutionCorrect answer: 2
Correct answer
2
Step-by-step explanation
Assuming association ( ),
Now,
mass of
mass of
molar mass of
Number of benzoic acid molecules associated,
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This is a previous-year question from JEE Main 2021, covering the Solutions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.