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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceOtherMediumRecall

JEE Main 4 September 2020, Shift 2, Chemistry Q35

Question 35 of 75 in this shift, Chemistry question 10 of 25.

The incorrect statement(s) among (a) - (c) is (are) : (a) W(VI) is more stable than Cr(VI). (b) in the presence of HCl, permanganate titrations provide satisfactory results. (c) some lanthanoid oxides can be used as phosphors.
  1. (1)(a) only
  2. (2)(b) onlyOfficial answer
  3. (3)(a) and (b) only
  4. (4)(b) and (c) only

Official answer

Option 2

NTA final key (Sep 2020).

Chapter
The d- and f-Block Elements
Topic
d-Block Elements
Idea tested
HCl Limitation in KMnO4 Titrations

Same idea in other shifts

Asked 2× in all
  1. 28 Jul 2022, Shift 2 · Q39Given below are two statements : One is labelled as **Assertion A** and the other is labelled as **Reason R** **Assertion A** :…EasyAssertion–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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.