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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyData or graph

JEE Main 9 January 2020, Shift 2, Chemistry Q29

Question 29 of 75 in this shift, Chemistry question 4 of 25, Section A.

A mixture of gases O2\mathrm{O_2}, H2\mathrm{H_2} and CO\mathrm{CO} are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :

The figure, in words

Options are four pressure-vs-time graphs (decaying curve, constant line, rising curve to plateau, linearly falling line).
  1. (1)[figure: graph of pressure vs time, curve decreasing steeply at first and flattening to a low constant value]Official answer
  2. (2)[figure: graph of pressure vs time, horizontal straight line (constant pressure)]
  3. (3)[figure: graph of pressure vs time, curve rising from an initial value and flattening to a constant higher value]
  4. (4)[figure: graph of pressure vs time, straight line decreasing linearly from the initial pressure towards zero]

Official answer

Option 1

NTA final key (Jan 2020).

Chapter
Surface Chemistry
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 42 of the 174 JEE Main shifts held from 2017 to 2026.