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Chemistry

Coordination Compounds

A Chemistry chapter of the NEET syllabus, and how to practise it for the computer-based exam.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Coordination Compounds carried 9 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Coordination Compounds, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

A 1 : 3 electrolyte in an aqueous solution is
  1. A.[CoCl2(NH3)4]Cl[\mathrm{CoCl}_{2}(\mathrm{NH}_{3})_{4}]\mathrm{Cl}
  2. B.[CoCl(NH3)5]Cl2[\mathrm{CoCl}(\mathrm{NH}_{3})_{5}]\mathrm{Cl}_{2}
  3. C.[Co(NH3)6]Cl3[\mathrm{Co}(\mathrm{NH}_{3})_{6}]\mathrm{Cl}_{3}
  4. D.[Co(NH3)3(NO2)3][\mathrm{Co}(\mathrm{NH}_{3})_{3}(\mathrm{NO}_{2})_{3}]
Answer and explanation

Answer: C

Only the ions OUTSIDE the coordination sphere are released in solution; ligands bound to the metal stay put. [Co(NH3)6]Cl3[\mathrm{Co}(\mathrm{NH}_{3})_{6}]\mathrm{Cl}_{3} has all six ammonia molecules coordinated and three chlorides as counter-ions, so it dissociates into one complex cation and three chloride ions - a 1 : 3 electrolyte. NCERT Class 12, Coordination Compounds (Werner's theory, primary and secondary valence).

Question 2 · NEET 2026

The complex which has facial and meridional isomers is (Given : py = pyridine and en = H2N−CH2−CH2−NH2\mathrm{H}_{2}\mathrm{N}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{NH}_{2})
  1. A.[Cr(py)3(Cl)3][\mathrm{Cr}(\mathrm{py})_{3}(\mathrm{Cl})_{3}]
  2. B.[Cr(H2O)6]3+[\mathrm{Cr}(\mathrm{H}_{2}\mathrm{O})_{6}]^{3+}
  3. C.[Co(NH3)4(H2O)2]3+[\mathrm{Co}(\mathrm{NH}_{3})_{4}(\mathrm{H}_{2}\mathrm{O})_{2}]^{3+}
  4. D.[Ni(en)2(H2O)2]2+[\mathrm{Ni}(\mathrm{en})_{2}(\mathrm{H}_{2}\mathrm{O})_{2}]^{2+}
Answer and explanation

Answer: A

Facial and meridional isomerism is specific to octahedral complexes of the type [Ma3b3][\mathrm{Ma}_{3}\mathrm{b}_{3}]. In the fac isomer the three identical ligands occupy one triangular face; in the mer isomer they lie in a plane through the metal. [Cr(py)3Cl3][\mathrm{Cr}(\mathrm{py})_{3}\mathrm{Cl}_{3}] has exactly this 3:3 arrangement. NCERT Class 12, Coordination Compounds (geometrical isomerism).

How to practise Coordination Compounds

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free NEET mini mock with answers.

Nearby Chemistry chapters

Questions

How many questions did Coordination Compounds have in NEET 2026?

Coordination Compounds carried 9 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Coordination Compounds PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Coordination Compounds important for NEET 2027?

It is part of the Chemistry syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

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