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Friday, 9 October

NEET UG 2026 · Chemistry · Question 78

NEET 2026 Chemistry, question 78

Question 78 of the NEET 2026 paper (re-exam) is a Chemistry question from Coordination Compounds. Its idea, Facial and Meridional Isomerism in [MA3B3], was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.

Updated 2026-10-08

Q78 · Chemistry

The complex which has facial and meridional isomers is

(Given : py = pyridine and en = H2N−CH2−CH2−NH2\mathrm{H_2N-CH_2-CH_2-NH_2})

  1. 1[Cr(py)3(Cl)3]\mathrm{[Cr(py)_3(Cl)_3]}Official answer
  2. 2[Cr(H2O)6]3+\mathrm{[Cr(H_2O)_6]^{3+}}
  3. 3[Co(NH3)4(H2O)2]3+\mathrm{[Co(NH_3)_4(H_2O)_2]^{3+}}
  4. 4[Ni(en)2(H2O)2]2+\mathrm{[Ni(en)_2(H_2O)_2]^{2+}}

Official answer: option 1 · NTA final answer key

Same idea

The only question on Facial and Meridional Isomerism in [MA3B3]

No other NEET paper from 2017–2026 tested this exact idea.

Facial and Meridional Isomerism in [MA3B3]: 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. Coordination Isomerism alone had 4.

Chapter analysisStudy this chapterPractise this chapter

Coordination Compounds: questions per paper

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