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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 27 July 2022, Shift 2, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

The plot of pH-metric titration of weak base NH4OH\mathrm{NH_4OH} vs strong acid HCl looks like :

The figure, in words

Four pH vs volume-of-acid titration curves (options A-D), each with a mark at pH 7 on the y-axis.
  1. (1)[figure: graph of pH (y-axis, mark at 7) vs volume of acid (x-axis); curve starts above 7 and falls in a gradual S-shape to below 7]Official answer
  2. (2)[figure: graph of pH (y-axis, mark at 7) vs volume of acid (x-axis); curve starts below 7 and rises in a gradual S-shape to above 7]
  3. (3)[figure: graph of pH (y-axis, mark at 7) vs volume of acid (x-axis); flat high pH, then a sharp vertical drop to a low flat pH below 7]
  4. (4)[figure: graph of pH (y-axis, mark at 7) vs volume of acid (x-axis); flat low pH below 7, then a sharp vertical rise to a high flat pH above 7]

Official answer

Option 1

NTA final key.

Chapter
Equilibrium
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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 108 of the 174 JEE Main shifts held from 2017 to 2026.