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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 2 September 2020, Shift 1, Chemistry Q27

Question 27 of 75 in this shift, Chemistry question 2 of 25.

For the following Assertion and Reason, the correct option is Assertion (A) : When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R) : The equilibrium constant of Cu2+(aq)+S2−(aq)⇌CuS(s)\mathrm{Cu^{2+}(aq)+S^{2-}(aq)\rightleftharpoons CuS(s)} is high because the solubility product is low.
  1. (1)Both (A) and (R) are true and (R) is the explanation for (A).
  2. (2)Both (A) and (R) are true but (R) is not the explanation for (A).Official answer
  3. (3)(A) is false and (R) is true.
  4. (4)Both (A) and (R) are false.

Official answer

Option 2

NTA final key (Sep 2020).

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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.