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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctHardConceptual

JEE Main 10 April 2023, Shift 1, Chemistry Q68

Question 68 of 90 in this shift, Chemistry question 8 of 30, Section A.

Which of the following statements are correct? (A) The M3+/M2+\mathrm{M^{3+}/M^{2+}} reduction potential for iron is greater than manganese. (B) The higher oxidation states of first row d-block elements get stabilized by oxide ion. (C) Aqueous solution of Cr2+\mathrm{Cr^{2+}} can liberate hydrogen from dilute acid. (D) Magnetic moment of V2+\mathrm{V^{2+}} is observed between 4.4 – 5.2 BM. Choose the correct answer from the options given below:
  1. (1)(A), (B) only
  2. (2)(B), (C) onlyOfficial answer
  3. (3)(C), (D) only
  4. (4)(A), (B), (D) only

Official answer

Option 2

NTA final key.

Chapter
The d- and f-Block Elements
Topic
d-Block Elements
Idea tested
Standard Electrode Potential Trends

Same idea in other shifts

Asked 5× in all
  1. 25 Jul 2022, Shift 1 · Q87Among Co3+, Ti2+, V2+\mathrm{Co^{3+},\ Ti^{2+},\ V^{2+}} and Cr2+\mathrm{Cr^{2+}} ions, one if used as a reagent cannot liberate H2\mathrm{H_2} from…HardNumerical value
  2. 25 Jun 2022, Shift 1 · Q69Among the following, which is the strongest oxidizing agent ?EasySingle correct
  3. 27 Jun 2022, Shift 2 · Q68In 3d series, the metal having the highest M2+/M\mathrm{M^{2+}/M} standard electrode potential isEasySingle correct
  4. 24 Feb 2021, Shift 1 · Q37The electrode potential of M2+/M\mathrm{M^{2+}/M} of 3d-series elements shows positive value for :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.