Which of the following compounds is not colored yellow? (a) Zn2[Fe(CN)6] (b) K3[Co(NO2)6] (c) (N

step 1 So in problem 163 of chapter 34 practical chemistry So in this question which of the following c

Which of the following compounds is not colored yellow? (a)...

Which of the following compounds is not colored yellow? (a) $\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ (b) $\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)_{6}\right]$ (c) $\left(\mathrm{NH}_{4}\right)_{3}\left[\mathrm{AS}\left(\mathrm{Mo}_{3} \mathrm{O}_{10}\right)_{4}\right]$ (d) $\mathrm{BaCrO}_{4}$

Which of the following compounds is not colored yellow?
(a) $\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
(b) $\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)_{6}\right]$
(c) $\left(\mathrm{NH}_{4}\right)_{3}\left[\mathrm{AS}\left(\mathrm{Mo}_{3} \mathrm{O}_{10}\right)_{4}\right]$
(d) $\mathrm{BaCrO}_{4}$

Key Concepts

Polyoxometalate Chemistry

Polyoxometalates are clusters composed of metal and oxygen atoms that form well-defined, often highly symmetrical structures. Their colors usually arise from extensive charge transfer and electronic delocalization within the metal-oxygen network, making their spectroscopic properties distinct from simpler coordination complexes.

Charge Transfer Processes

Charge transfer processes contribute significantly to the coloration of compounds by enabling electron transfer either from ligand to metal (LMCT) or from metal to ligand (MLCT). These transitions typically result in intense absorption bands and can produce vivid colors that differ from those expected solely based on d–d transitions.

Electronic Transitions

The colors of many inorganic compounds arise from electronic transitions within the metal center. These include d–d transitions, where electrons move between different d orbitals, and are affected by the ligand field created by surrounding ligands, as well as charge transfer transitions that involve electron movement between the metal and its ligands.

Coordination Compounds

Coordination compounds are molecules in which central metal ions are bonded to surrounding ligands. The color of these compounds is determined by the metal ion’s oxidation state, the nature of its ligands, and the overall geometry of the complex, which together influence the pattern of electronic transitions.

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