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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceMatch the listMediumRecall

JEE Main 8 April 2023, Shift 1, Chemistry Q71

Question 71 of 90 in this shift, Chemistry question 11 of 30, Section A. NTA dropped this question from the final key; it is left out of every count on this site.

Match List I with List II: List I (Species) | List II (Maximum allowed concentration in ppm in drinking water) A. F−\mathrm{F^-} | I. <50<50 ppm B. SO42−\mathrm{SO_4^{2-}} | II. <5<5 ppm C. NO3−\mathrm{NO_3^-} | III. <2<2 ppm D. Zn\mathrm{Zn} | IV. <500<500 ppm Choose the correct answer from the options given below:
  1. (1)A-I, B-II, C-III, D-IV
  2. (2)A-IV, B-III, C-II, D-I
  3. (3)A-II, B-I, C-III, D-IV
  4. (4)A-III, B-II, C-I, D-IV

Official answer

Dropped by NTA (marks given to all)

NTA final key: NTA final key: DROP (question dropped).

Chapter
Environmental Chemistry
Topic
Environmental Chemistry
Idea tested
Fluoride Limits in Drinking Water

Same idea in other shifts

Asked 3× in all
  1. 27 Jul 2022, Shift 1 · Q73Match List I with List II. List I (Pollutant) | List II (Disease/sickness) A. Sulphate (>500 ppm) | I. Methemoglobinemia B. Nitrate (>50…MediumMatch the list
  2. 3 Aug 2021, Shift 2 · Q41Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Fluoride ion…EasyAssertion–reason
  3. 2 Apr 2017 (offline) · Q44A water sample has ppm level concentration of following anions F−=10\mathrm{F^-}=10 ; SO42−=100\mathrm{SO_4^{2-}}=100 ; NO3−=50\mathrm{NO_3^-}=50 The…EasySingle correct

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.