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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2024, Shift 2, Chemistry Q61

Question 61 of 90 in this shift, Chemistry question 1 of 30, Section A.

Molality (mm) of 3 M aqueous solution of NaCl is : (Given : Density of solution =1.25 g mL−1=1.25\ \mathrm{g\,mL^{-1}}, Molar mass in g mol−1\mathrm{g\,mol^{-1}} : Na-23, Cl-35.5)
  1. (1)2.79 mOfficial answer
  2. (2)3.85 m
  3. (3)2.90 m
  4. (4)1.90 m

Official answer

Option 1

NTA final key.

Chapter
Solutions
Topic
Mole Concept
Idea tested
Molarity and Molality Interconversion

Same idea in other shifts

Asked 5× in all
  1. 6 Apr 2024, Shift 1 · Q61The density of 'x' M solution ('x' molar) of NaOH is 1.12 g mL−1^{-1}, while in molality, the concentration of the solution is 3 m (3…EasySingle correct
  2. 9 Apr 2024, Shift 1 · Q81Molarity (M) of an aqueous solution containing xx g of anhyd. CuSO4\mathrm{CuSO_4} in 500 mL solution at 32 ∘^\circC is 2×10−12\times10^{-1} M.…MediumNumerical value
  3. 30 Jul 2022, Shift 2 · Q51The density of 4 molal solution of NaOH is 1.160 g mL−1\mathrm{mL^{-1}}. The molarity of the solution is ________ M. (Given : Molar mass of…MediumNumerical value
  4. 26 Aug 2021, Shift 1 · Q51An aqueous KCl solution of density 1.20 g mL−1^{-1} has a molality of 3.30 mol kg−1^{-1}. The molarity of the solution in mol L−1^{-1} 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.