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OJEE Coordination Compounds — practice questions — page 2

Explore 109 free Coordination Compounds questions in OJEE 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 31–60 of 109.

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 →In a coordination compound, the central atom is usually:Read the answer and worked solution →Coordination number is:Read the answer and worked solution →In [Cu(NH3)4]²⁺ what is the oxidation number of Cu?Read the answer and worked solution →What is the coordination number in [Co(NH3)6]³⁺?Read the answer and worked solution →What is the geometry of complex with coordination number 6 typically?Read the answer and worked solution →What is the geometry of [Ni(CN)4]²⁻?Read the answer and worked solution →Crystal Field Theory: in an OCTAHEDRAL field, the d-orbitals split into:Read the answer and worked solution →Spectrochemical series (ligand strength): which is a STRONG-field ligand?Read the answer and worked solution →Which type of isomerism arises when two ligands can bind through different donor atoms (e.g., NO2⁻ via N vs O)?Read the answer and worked solution →Cis and trans isomers of [Co(NH3)4Cl2]⁺ are examples of:Read the answer and worked solution →Which complex is paramagnetic?Read the answer and worked solution →EDTA is a:Read the answer and worked solution →The complex [Fe(CN)6]⁴⁻ is:Read the answer and worked solution →In strong-field octahedral, electron filling order in d-orbitals follows:Read the answer and worked solution →Oxidation state of Co in [Co(NH3)5Cl]Cl2:Read the answer and worked solution →Number of geometric isomers of [Pt(NH3)2Cl2] (square planar):Read the answer and worked solution →For octahedral d6 with weak-field ligands (high-spin), number of unpaired electrons:Read the answer and worked solution →For octahedral d6 with STRONG-field ligands (low-spin), number of unpaired electrons:Read the answer and worked solution →Number of unpaired electrons in [FeF6]³⁻ (high-spin, F⁻ weak-field):Read the answer and worked solution →Hybridization in [Ni(CO)4] (Ni is 0 oxidation state, sp3 because CO is strong-field for Ni⁰):Read the answer and worked solution →For [Cr(H2O)6]³⁺, d-electron count and magnetic behavior:Read the answer and worked solution →Which one is an ambidentate ligand?Read the answer and worked solution →For octahedral [Mn(H2O)6]²⁺, d-electron count and unpaired e⁻ count:Read the answer and worked solution →

Worked practice questions

The IUPAC name of [Co(NH₃)₆]Cl₃ is:

  1. Hexacobalt(III) ammoniachloride
  2. Cobalt(III) hexaamminechloride
  3. Hexaammoniacobalt(3+) chloride
  4. Hexaamminecobalt(III) chloride
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Correct answer: D. Hexaamminecobalt(III) chloride

**Hexaamminecobalt(III) chloride**: ligand 'ammine' for NH₃ with prefix 'hexa-' then metal name 'cobalt', oxidation state in Roman numerals (III) then counter anion 'chloride'.

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In writing the formula of a coordination entity, the ligands are listed:

  1. Most electronegative first
  2. Largest ligand first
  3. Anions first, then neutral ligands
  4. Alphabetically, regardless of charge
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Correct answer: D. Alphabetically, regardless of charge

**Modern IUPAC convention:** list **ligands alphabetically** (formula AND name), regardless of charge. Polyatomic ligand formulas go in parentheses. Whole entity in square brackets.

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In the octahedral complex [Co(NH₃)₃(NO₂)₃], the two geometrical isomers are called:

  1. facial (fac) and meridional (mer)
  2. cis and trans
  3. d and l
  4. dextro and laevo
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Correct answer: A. facial (fac) and meridional (mer)

For octahedral M_a₃b₃ complexes: **fac-** isomer = three of the same ligand occupy adjacent corners of an octahedral face **mer-** = three of the same ligand around the meridian of the octahedron.

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