Answer: Spectrochemical series ranks field strength (Delta); nephelauxetic series ranks the ability to expand d orbital size (reduce electron repulsion, measured by beta).
- A Spectrochemical series ranks field strength (Delta); nephelauxetic series ranks the ability to expand d orbital size (reduce electron repulsion, measured by beta)
- B The two series are claimed to be in fact largely identical in highly everything that each one measures during normal conditions as generally observed in typical laboratory settings
- C The spectrochemical series is claimed to exist mainly to classify complex colour and to serve no other purpose under usual circumstances according to most researchers
- D The nephelauxetic series is claimed to instead classify coordination complexes mainly by their geometric isomer type in the majority of cases studied as widely reported
Correct answer: A. Spectrochemical series ranks field strength (Delta); nephelauxetic series ranks the ability to expand d orbital size (reduce electron repulsion, measured by beta)
Explanation: Nephelauxetic (cloud-expanding) effect: covalent bonding with ligands delocalises metal d electrons, reducing electron-electron repulsion. beta = B(complex)/B(free ion); B is the Racah parameter.
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.