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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 8 April 2026, Shift 2, Chemistry Q54

Question 54 of 75 in this shift, Chemistry question 4 of 25, Section A.

Which of the following statements are not correct ? A. For water, magnitude of Kb\mathrm{K_b} is more than the magnitude of Kf\mathrm{K_f}. B. The elevation in boiling point of water when a non-volatile solute is added to it is larger in magnitude than its depression in freezing point. C. Osmotic pressure measurement is preferred over any other colligative property to determine molar mass of proteins and polymers. D. The dimerised form of benzoic acid in benzene is C6H5−C(=O)−OH⋯O=C(OH)−C6H5\mathrm{C_6H_5{-}C(=O){-}OH \cdots O{=}C(OH){-}C_6H_5} Choose the correct answer from the options given below :

The figure, in words

Option D shows the benzoic acid dimer drawn as two C6H5-C(=O)-OH units hydrogen bonded: C6H5-C(=O)-OH ... O=C(OH)-C6H5 (the C=O of one unit bonded to the OH of the other).
  1. (1)A and B only
  2. (2)A and D only
  3. (3)A, B and D onlyOfficial answer
  4. (4)A, C and D only

Official answer

Option 3

NTA final key.

Chapter
Solutions
Topic
Colligative Properties
Idea tested
Boiling Point Elevation

Same idea in other shifts

Asked 5× 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. 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
  3. 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
  4. 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

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.