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AIIMS UG Coordination Compounds — practice questions

Explore 43 free Coordination Compounds questions in AIIMS UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Coordination Compounds questions and exercises with answers

Showing questions 1–30 of 43.

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 →In the coordination compound K₃[Fe(CN)₆], the coordination sphere 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 →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 →Chlorophyll, haemoglobin and vitamin B₁₂ are coordination compounds of:Read the answer and worked solution →Ethylenediamine (en) is best described as a:Read the answer and worked solution →The biological molecule HAEMOGLOBIN contains which metal at its centre?Read the answer and worked solution →A COORDINATION COMPOUND consists of a central metal atom (or ion) BONDED to a set of surrounding molecules or ions, calledRead the answer and worked solution →The COORDINATION NUMBER of the central metal in a complex isRead the answer and worked solution →A ligand that has ONLY ONE donor atom (which forms a single bond to the central metal) is calledRead the answer and worked solution →Cis-trans isomerism is observed inRead the answer and worked solution →Coordination compounds of transition metals are often COLOURED. CFT explains this colour as arising fromRead the answer and worked solution →$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in this complex isRead the answer and worked solution →NEET · Chemistry · Tap d-Block Coordination ExamplesRead the answer and worked solution →Sort each ligand by how many donor atoms it usesRead the answer and worked solution →Match each term to its definitionRead the answer and worked solution →True or false: coordination numberRead the answer and worked solution →Counting the coordination numberRead the answer and worked solution →Match each complex to its shapeRead the answer and worked solution →Sort each complex by its geometryRead the answer and worked solution →Complete the coordination sphere ruleRead the answer and worked solution →True or false: ambidentate ligandsRead the answer and worked solution →Chelate or ambidentate?Read the answer and worked solution →Complete the definition of oxidation numberRead the answer and worked solution →Match each theory to what it explainsRead the answer and worked solution →Tap every failing of Valence Bond TheoryRead the answer and worked solution →True or false: the theories and their limitsRead 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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In the coordination compound K₃[Fe(CN)₆], the coordination sphere is:

  1. Fe³⁺
  2. CN⁻ only
  3. K₃
  4. [Fe(CN)₆]³⁻
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Correct answer: D. [Fe(CN)₆]³⁻

**Coordination sphere** = central atom + ligands within the square brackets = **[Fe(CN)₆]³⁻**. K⁺ is the **counter ion** (outside the brackets). The coordination number of Fe³⁺ is 6.

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