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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 16 March 2021, Shift 2, Chemistry Q38

Question 38 of 90 in this shift, Chemistry question 8 of 30, Section A.

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers Ce = 58, Gd = 64 and Eu = 63.) (a) (NH4)2[Ce(NO3)6]\mathrm{(NH_4)_2[Ce(NO_3)_6]} (b) Gd(NO3)3\mathrm{Gd(NO_3)_3} and (c) Eu(NO3)3\mathrm{Eu(NO_3)_3} Answer is :
  1. (1)(a) < (b) < (c)
  2. (2)(a) < (c) < (b)Official answer
  3. (3)(b) < (a) < (c)
  4. (4)(c) < (a) < (b)

Official answer

Option 2

NTA final key.

Chapter
The d- and f-Block Elements
Topic
f-Block Elements
Idea tested
Magnetic and Spectral Properties

Same topic in other shifts

All f-Block Elements questions
  1. 4 Apr 2026, Shift 1 · Q60The correct statements among the following are, A. Mo(VI) and W(VI) are less stable than Cr(VI). B. Ce4+\mathrm{Ce^{4+}} and…HardOther
  2. 4 Apr 2026, Shift 2 · Q59Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number: Eu-63, Gd-64, Dy-66, Ho-67, Tm-69,…MediumOther
  3. 9 Apr 2024, Shift 1 · Q87Number of colourless lanthanoid ions among the following is ________. Eu3+,Lu3+,Nd3+,La3+,Sm3+\mathrm{Eu^{3+}, Lu^{3+}, Nd^{3+}, La^{3+}, Sm^{3+}}MediumNumerical value
  4. 6 Apr 2023, Shift 1 · Q70Strong reducing and oxidizing agents among the following, respectively, areMediumSingle correct
  5. 3 Aug 2021, Shift 2 · Q33The correct order of the basic character for the following metal hydroxides isMediumSingle correct
  6. 3 Aug 2021, Shift 2 · Q39Which one of the following statements is correct?MediumSingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.