JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 27 June 2022, Shift 2, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

A solution containing

2.5 \times 10^{-3}

kg of a solute dissolved in

75 \times 10^{-3}

kg of water boils at 373.535 K. The molar mass of the solute is ________

\mathrm{g\ mol^{-1}}

. [nearest integer] (Given :

\mathrm{K_b(H_2O)}

= 0.52 K kg

\mathrm{mol^{-1}}

and boiling point of water = 373.15 K)

Official answer

NTA final key.

Chapter: Solutions
Topic: Colligative Properties
Idea tested: Boiling Point Elevation

Same idea in other shifts

Asked 13× in all

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13 Apr 2023, Shift 2 · Q84Sea water contains 29.25% NaCl and 19% $\mathrm{MgCl_2}$ by weight of solution. The normal boiling point of the sea water is ______…MediumNumerical value
26 Jul 2022, Shift 2 · Q84The elevation in boiling point for 1 molal solution of non-volatile solute A is 3 K. The depression in freezing point for 2 molal solution…EasyNumerical value
27 Jul 2022, Shift 1 · Q65Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile…EasySingle correct

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.