JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 29 July 2022, Shift 2, Chemistry Q83

Question 83 of 90 in this shift, Chemistry question 23 of 30, Section B.

1.80 g of solute A was dissolved in 62.5

\mathrm{cm^3}

of ethanol and freezing point of the solution was found to be 155.1 K. The molar mass of solute A is __ g

\mathrm{mol^{-1}}

. [Given: Freezing point of ethanol is 156.0 K. Density of ethanol is 0.80 g

\mathrm{cm^{-3}}

. Freezing point depression constant of ethanol is 2.00 K kg

\mathrm{mol^{-1}}

]

Official answer

NTA final key.

Chapter: Solutions
Topic: Colligative Properties
Idea tested: Molar Mass Determination

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.