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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 4 April 2024, Shift 1, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

2.5 g of a non-volatile, non-electrolyte is dissolved in 100 g of water at 25°C. The solution showed a boiling point elevation by 2°C. Assuming the solute concentration is negligible with respect to the solvent concentration, the vapor pressure of the resulting aqueous solution is ________ mm of Hg (nearest integer) [Given : Molal boiling point elevation constant of water (Kb)(\mathrm{K_b}) = 0.52 K. kg mol−1\mathrm{mol^{-1}}, 1 atm pressure = 760 mm of Hg, molar mass of water = 18 g mol−1\mathrm{mol^{-1}}]

Official answer

707

NTA final key.

Chapter
Solutions
Topic
Colligative Properties
Idea tested
Boiling Point Elevation

Same idea in other shifts

Asked 13× in all
  1. 4 Apr 2026, Shift 1 · Q75A non-volatile, non-electrolyte solid solute when dissolved in 4040 g of a solvent, the vapour pressure of the solvent decreased from…MediumNumerical value
  2. 8 Apr 2026, Shift 2 · Q54Which of the following statements are not correct ? A. For water, magnitude of Kb\mathrm{K_b} is more than the magnitude of…MediumOtherHas a figure
  3. 2 Apr 2025, Shift 2 · Q73When 1 g each of compounds AB and AB2\mathrm{AB_2} are dissolved in 15 g of water separately, they increased the boiling point of water by…MediumNumerical value
  4. 3 Apr 2025, Shift 1 · Q542 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is: (Given :…EasySingle correct
  5. 13 Apr 2023, Shift 2 · Q84Sea water contains 29.25% NaCl and 19% MgCl2\mathrm{MgCl_2} by weight of solution. The normal boiling point of the sea water is ______…MediumNumerical value
  6. 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
  7. 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
  8. 27 Jun 2022, Shift 1 · Q832 g of a non-volatile non-electrolyte solute is disolved in 200 g of two different solvents A and B whose ebullioscopic constants are in…EasyNumerical value

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.