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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 30 June 2022, Shift 1, Chemistry Q67

Question 67 of 90 in this shift, Chemistry question 7 of 30, Section A.

ΔG∘\Delta \mathrm{G}^\circ vs T plot for the formation of MgO, involving reaction 2Mg+O2→2MgO2\mathrm{Mg}+\mathrm{O_2}\rightarrow 2\mathrm{MgO}, will look like :

The figure, in words

Each option is a graph with y-axis labelled ΔG° and x-axis labelled T; each starts at a positive intercept above the T axis.
  1. (1)[figure: graph of ΔG∘\Delta G^\circ vs T; rising line, then a steeper rising segment after a bend]Official answer
  2. (2)[figure: graph of ΔG∘\Delta G^\circ vs T; single straight rising line]
  3. (3)[figure: graph of ΔG∘\Delta G^\circ vs T; rising line, then a horizontal segment after a bend]
  4. (4)[figure: graph of ΔG∘\Delta G^\circ vs T; rising line, then a falling segment after a peak]

Official answer

Option 1

NTA final key.

Chapter
General Principles and Processes of Isolation of Elements
Topic
Metallurgical Extraction
Idea tested
Ellingham Diagram Phase Transitions

Same idea in other shifts

Asked 2× in all
  1. 12 Apr 2023, Shift 1 · Q66Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : In the Ellingham…MediumAssertion–reason

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.