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Coordination Compounds — NEET & JEE Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

According to Werner's theory, what is the primary valence of a metal?
  1. Its normally ionisable valence, satisfied by negative ions ✓
  2. Its fixed coordination number and spatial arrangement
  3. The number of neutral ligands only
  4. The number of unpaired d electrons
Answer: A. Werner's primary valence corresponds to oxidation state and is normally ionisable; secondary valence is non-ionisable and equals coordination number. Interchanging the two is the main trap.
Why not B: Fixed coordination number corresponds to Werner's secondary valence.
Why not C: Primary valence is an oxidation-state concept and is not counted from neutral ligands.
Why not D: Magnetic electron count is unrelated to Werner's two-valence classification.
What is the IUPAC name of K3[Fe(CN)6]?
  1. Potassium hexacyanidoiron(III)
  2. Tripotassium iron hexacyanide
  3. Potassium hexacyanidoferrate(III) ✓
  4. Potassium hexacyanidoferrate(II)
Answer: C. The anionic entity is hexacyanidoferrate and iron is +3: x−6 = −3. Ferrate(II) is the closest trap from confusing ferricyanide with ferrocyanide.
Why not A: Because the complex is anionic, iron takes the Latin-root ferrate name.
Why not B: Stoichiometric prefixes for counter ions are not used this way in naming ionic compounds.
Why not D: Six CN− ligands and a −3 complex charge require Fe(III), not Fe(II).
For [Fe(C2O4)3]3-, what are the oxidation state of Fe and its coordination number?
  1. Fe(III), CN 6 ✓
  2. Fe(II), CN 3
  3. Fe(VI), CN 6
  4. Fe(III), CN 3
Answer: A. x + 3(−2) = −3 gives x = +3, and three didentate oxalates give CN = 3×2 = 6. The Fe(III), CN 3 option stops at ligand count.
Why not B: Three oxalates contribute −6 total, so a −3 complex requires Fe(III), and coordination counts donor atoms.
Why not C: The six donor atoms determine coordination number, not metal charge.
Why not D: Each of three oxalate ligands is didentate, giving six Fe-O bonds.

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Other NEET Chemistry chapters

Some Basic Concepts of ChemistryStructure of AtomClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureThermodynamicsEquilibrium

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Questions

How many NEET and JEE questions are there on Coordination Compounds?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET and JEE Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.