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NEET UG Unit 2B1: Transition Metals & Coordination Compounds — practice questions

Explore 28 free Unit 2B1: Transition Metals & Coordination Compounds questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 2B1: Transition Metals & Coordination Compounds questions and exercises with answers

Showing questions 1–28 of 28.

1 mol of CoCl₃·4NH₃ (green or violet) gives how many moles of AgCl?Read the answer and worked solution →In a coordination compound, the central metal atom/ion is best classified as a:Read the answer and worked solution →Ethylenediaminetetraacetate (EDTA⁴⁻) is what type of ligand?Read the answer and worked solution →In the coordination compound K₃[Fe(CN)₆], the coordination sphere is:Read the answer and worked solution →In K₃[Fe(C₂O₄)₃], the oxidation state of Fe is:Read the answer and worked solution →In [Ni(CO)₄], the oxidation state of Ni is:Read the answer and worked solution →Complexes in which the metal is bound to only one kind of donor group, e.g., [Co(NH₃)₆]³⁺, are called:Read the answer and worked solution →The IUPAC name of [Co(NH₃)₆]Cl₃ is:Read the answer and worked solution →In writing the formula of a coordination entity, the ligands are listed:Read the answer and worked solution →In the octahedral complex [Co(NH₃)₃(NO₂)₃], the two geometrical isomers are called:Read the answer and worked solution →The spin-only magnetic moment μ (in Bohr Magnetons, BM) for n unpaired electrons is given by:Read the answer and worked solution →[Ni(CO)₄], [Fe(CO)₅] and [Cr(CO)₆] are respectively:Read the answer and worked solution →Chlorophyll, haemoglobin and vitamin B₁₂ are coordination compounds of:Read the answer and worked solution →Hardness of water is estimated by titration with:Read the answer and worked solution →The hybridization of Fe in $\mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6]$ complex isRead the answer and worked solution →For 1 mol of CoCl₃·4NH₃ (green or violet isomer), moles of AgCl precipitated by excess AgNO₃ isRead the answer and worked solution →EDTA⁴⁻ acts as which type of ligand when fully coordinated to a metal ion?Read the answer and worked solution →The oxidation state of Fe in K₄[Fe(CN)₆] isRead the answer and worked solution →The coordination number of Fe in [Fe(C₂O₄)₃]³⁻ isRead the answer and worked solution →Which of these ligands is ambidentate — capable of binding through either of two different donor atoms?Read the answer and worked solution →The IUPAC name of [Ni(NH₃)₆]Cl₂ isRead the answer and worked solution →Which coordination polyhedron does [Ni(CO)₄] adopt?Read the answer and worked solution →Which of the following is a homoleptic complex?Read the answer and worked solution →The primary and secondary valences of Co in [Co(NH₃)₆]Cl₃ are respectivelyRead the answer and worked solution →Chelate complexes tend to be more stable than similar complexes with unidentate ligands. This effect is calledRead the answer and worked solution →The correct order of ligand denticity, from smallest to largest, isRead the answer and worked solution →The coordination sphere of K₄[Fe(CN)₆] isRead the answer and worked solution →The correct IUPAC name of [NiCl₂(PPh₃)₂] isRead the answer and worked solution →

Worked practice questions

1 mol of CoCl₃·4NH₃ (green or violet) gives how many moles of AgCl?

  1. 2
  2. 1
  3. 3
  4. 0
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Correct answer: B. 1

CoCl₃·4NH₃ = **[CoCl₂(NH₃)₄]Cl**, a 1:1 electrolyte. Only 1 Cl⁻ is outside the coord sphere → **1 mol AgCl**. The other 2 Cl⁻ are coordinated to Co. Green and violet are *cis*/*trans* geometrical isomers.

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In a coordination compound, the central metal atom/ion is best classified as a:

  1. Arrhenius base
  2. Lewis acid (electron pair acceptor)
  3. Brønsted acid
  4. Lewis base
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Correct answer: B. Lewis acid (electron pair acceptor)

Central metal atom/ion accepts electron pairs from ligands → **Lewis acid**. Ligands donate electron pairs → **Lewis bases**. The bond is a coordinate (dative) bond.

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Ethylenediaminetetraacetate (EDTA⁴⁻) is what type of ligand?

  1. Unidentate
  2. Didentate
  3. Ambidentate
  4. Hexadentate (binds through 2 N + 4 O atoms)
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Correct answer: D. Hexadentate (binds through 2 N + 4 O atoms)

**EDTA⁴⁻** is a classic **hexadentate** chelating ligand — binds the metal through **2 nitrogen and 4 carboxylate-oxygen donor atoms**, forming 5 chelate rings. Used to titrate Ca²⁺/Mg²⁺ for water-hardness estimation.

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