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Friday, 9 October

NEET UG 2018 · Chemistry · Question 73

NEET 2018 Chemistry, question 73

Question 73 of the NEET 2018 paper (code AA) is a Chemistry question from Coordination Compounds. Its idea, Nickel Complex Geometry Trio, was asked twice, in 2018 and 2025, across NEET 2017–2026. The CBSE official answer key gives option 2.

Updated 2026-10-08

Q73 · Chemistry

The geometry and magnetic behaviour of the complex [Ni(CO)4]\mathrm{[Ni(CO)_4]} are

  1. 1square planar geometry and paramagnetic
  2. 2tetrahedral geometry and diamagneticOfficial answer
  3. 3square planar geometry and diamagnetic
  4. 4tetrahedral geometry and paramagnetic

Official answer: option 2 · CBSE official answer key

Same idea

Nickel Complex Geometry Trio, in other papers

NEET asked this idea twice, in 2018 and 2025. The other question below.

  • 2025 Q51Which of the following are paramagnetic? A. [NiCl4]2−[NiCl_4]^{2-} B. Ni(CO)4Ni(CO)_4 C. [Ni(CN)4]2−[Ni(CN)_4]^{2-} D. [Ni(H2O)6]2+[Ni(H_2O)_6]^{2+} E. Ni(PPh3)4Ni(PPh_3)_4…Other · Medium

Nickel Complex Geometry Trio: every question and how it was framed

The chapter

Coordination Compounds in ten years of NEET

27 questions from 2017–2026, asked in 10 of 10 papers, about 2.6 a paper. Crystal Field Theory alone had 10.

Chapter analysisStudy this chapterPractise this chapter

Coordination Compounds: questions per paper

0364’173’181’191’202’212’222’233’243’256’26