NEET UG · Chemistry

Coordination Compounds and d- and f-Block Elements

18 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 18 questions

  1. According to Alfred Werner's coordination theory, which of the following cobalt complexes will produce exactly two moles of silver chloride (AgCl) precipitate per mole of complex when treated with exc…
  2. What is the correct IUPAC nomenclature for the coordination compound [Cr(NH3)4Cl2]Cl?
  3. Which type of structural isomerism is demonstrated by the pair of coordination compounds [Co(NH3)5(SO4)]Br and [Co(NH3)5Br]SO4?
  4. Why does the trans-isomer of the octahedral coordination complex [Co(en)2Cl2]+ exhibit zero optical activity, whereas the cis-isomer exists as a pair of optically active enantiomers?
  5. According to Crystal Field Theory (CFT), what is the electronic configuration of a d4 transition metal ion in an octahedral crystal field when the crystal field splitting energy is greater than the pa…
  6. What is the calculated 'spin-only' magnetic moment (in Bohr Magnetons, BM) for the complex ion [Fe(H2O)6]2+?
  7. How does the crystal field splitting energy in a tetrahedral complex (Δt) quantitatively relate to that in an octahedral complex (Δo) for identical metal ions and ligands?
  8. Which sequence correctly arranges the common ligands in increasing order of crystal field splitting strength according to the spectrochemical series?
  9. What is the nature of the synergic bonding mechanism in transition metal carbonyl complexes such as [Ni(CO)4] and [Fe(CO)5]?
  10. Why does copper have a positive standard reduction potential (E°(Cu2+/Cu) = +0.34 V), whereas all other first-row (3d) transition metals possess negative standard reduction potentials?
  11. What is the primary cause of the intense deep purple color of potassium permanganate (KMnO4), given that the manganese ion (Mn7+) has a d0 electronic configuration with zero d-electrons?
  12. How does the chemical equilibrium between chromate (CrO42-) and dichromate (Cr2O72-) ions respond to changes in solution pH?
  13. What is the stoichiometric equivalent weight of potassium permanganate (KMnO4, molar mass M) when it acts as an oxidizing agent in an acidic medium?
  14. Why do zirconium (Zr, atomic number 40) and hafnium (Hf, atomic number 72) possess virtually identical atomic and ionic radii (approximately 160 pm and 159 pm, respectively)?
  15. Which of the following compounds is an example of an interstitial compound formed by transition metals with small non-metal atoms?
  16. What is the coordination number and the oxidation state of the central cobalt atom in the complex [Co(en)3]3+?
  17. Which hexadentate chelating ligand is widely utilized in medical toxicology for the clinical treatment of acute lead poisoning?
  18. Why is the basic strength of lanthanoid hydroxides observed to decrease progressively across the series from La(OH)3 to Lu(OH)3?

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