Learn

Friday, 9 October

NEET UG 2018 · Chemistry · Question 70

NEET 2018 Chemistry, question 70

Question 70 of the NEET 2018 paper (code AA) is a Chemistry question from The d- and f-Block Elements. Its idea, Magnetic Moment and Colour of d- and f-Block Ions, was asked 7 times, in 2018, 2020, 2024, 2025 and 2026, across NEET 2017–2026. The CBSE official answer key gives option 4.

Updated 2026-10-08

Q70 · Chemistry

Which one of the following ions exhibits d-d transition and paramagnetism as well ?

  1. 1MnO4−\mathrm{MnO_4^-}
  2. 2Cr2O72−\mathrm{Cr_2O_7^{2-}}
  3. 3CrO42−\mathrm{CrO_4^{2-}}
  4. 4MnO42−\mathrm{MnO_4^{2-}}Official answer

Official answer: option 4 · CBSE official answer key

Same idea

Magnetic Moment and Colour of d- and f-Block Ions, in other papers

NEET asked this idea 7 times, in 2018, 2020, 2024, 2025 and 2026. The other 6 questions below.

  • 2026 Q67The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce = 58, Nd = 60, Tb = 65 and Ho = 67)One-line MCQ · Medium
  • 2025 Q71Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number…Two statements · Medium
  • 2024 Q67'Spin only' magnetic moment is same for which of the following ions? A. Ti3+^{3+} B. Cr2+^{2+} C. Mn2+^{2+} D. Fe2+^{2+} E. Sc3+^{3+}…Other · Medium
  • 2024 Q94The pair of lanthanoid ions which are diamagnetic isOne-line MCQ · Hard
  • 2020 Q103The calculated spin only magnetic moment of Cr2+\mathrm{Cr^{2+}} ion is :Numerical · Easy
  • 2018 Q69Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code : Column…Match the lists · Medium

Magnetic Moment and Colour of d- and f-Block Ions: every question and how it was framed

The chapter

The d- and f-Block Elements in ten years of NEET

21 questions from 2017–2026, asked in 10 of 10 papers, about 2.0 a paper. d- and f-Block Elements alone had 21.

The d- and f-Block Elements: questions per paper

0242’172’181’192’202’212’222’233’242’253’26