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Saturday, 31 October

JEE Main 2026 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 5 April 2026, Shift 2, Chemistry Q73

Question 73 of 75 in this shift, Chemistry question 23 of 25, Section B.

20 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height of solution in a tube dipped in a solution (A) is found to be 80.0 mm higher than the tube dipped in water. The molar mass of hemoglobin is __________ kg mol−1^{-1}. (Nearest integer) (Given : g = 10 m s−2^{-2}, R = 8.3 kPa dm3^3 K−1^{-1}mol−1^{-1}, density of solution = 1000 kg m−3^{-3})

Official answer

62

NTA final key.

Chapter
Solutions
Topic
Colligative Properties
Idea tested
Osmometry for Macromolecule Molar Mass

Same idea in other shifts

Asked 2× in all
  1. 28 Jun 2022, Shift 2 · Q832.5 g of protein containing only glycine (C2H5NO2\mathrm{C_2H_5NO_2}) is dissolved in water to make 500 mL of solution. The osmotic pressure of…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.