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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceDiagram basedHardConceptual

JEE Main 2 April 2025, Shift 2, Chemistry Q51

Question 51 of 75 in this shift, Chemistry question 1 of 25, Section A.

'xx' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1∘1^\circC to 25∘25^\circC. Which out of the following plots, is best suited for the change in the molarity (M) of the solution with respect to temperature ? [Consider the solubility of NaCl remains unchanged over the temperature range]

The figure, in words

Four graphs of molarity M (y-axis) versus temperature t/°C (x-axis, ticks at 5, 10, 15), given as options.
  1. (1)[figure: graph of M vs t/°C (axis ticks 5, 10, 15); curve rises quickly to a maximum at low t then decreases gradually]Official answer
  2. (2)[figure: graph of M vs t/°C (axis ticks 5, 10, 15); straight line decreasing]
  3. (3)[figure: graph of M vs t/°C (axis ticks 5, 10, 15); curve drops steeply to a shallow minimum at low t then increases linearly]
  4. (4)[figure: graph of M vs t/°C (axis ticks 5, 10, 15); straight line increasing]

Official answer

Option 1

NTA final key.

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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.