The colour of potassium dichromate is due to

Important Questions on Coordination Compounds

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Identify the correct trend given below:

(Atomic No. = Ti : 22, Cr : 24 and Mo : 42)

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Homoleptic octahedral complexes of a metal ion $\prime M^{3+}\prime$ with three monodentate ligands $L_1, L_2 \mathrm{a}\mathrm{n}\mathrm{d} L_3$ absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The octahedral complex of a metal ion ${\mathrm{M}}^{3+}$ with four monodentate ligands ${\mathrm{L}}_1, {\mathrm{L}}_2, {\mathrm{L}}_3 \mathrm{and} {\mathrm{L}}_4$ absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

When concentrated $\mathrm{HCl}$ is added to aqueous solution of $\mathrm{C}\mathrm{o}\mathrm{C}{\mathrm{l}}_2$, its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in reaction?

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Jahn-Teller effect is not observed in high spin complexes of

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Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The calculated spin-only magnetic moments $\left(\mathrm{B}\mathrm{M}\right)$ of the anionic and cationic species out of ${\left[\text{Fe}{\left({\text{H}}_2\text{O}\right)}_6\right]}^{+2}$ and ${\left[\text{Fe }{\left(\text{CN}\right)}_6\right]}^{4-}$ respectively, are:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

In aqueous solution, ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}\left(\mathrm{X}\right)$ reacts with molecular oxygen in the presence of excess ${\mathrm{NH}}_3$ to give a new complex $\mathrm{Y}.$ The number of unpaired electrons in $\mathrm{X}$ and $\mathrm{Y}$ are, respectively

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The correct order of the spin –only magnetic moment of metal ions in the following low-spin complexes, ${\left[\mathrm{V}{\left(\mathrm{C}\mathrm{N}\right)}_6\right]}^{4-},{\left[\mathrm{F}\mathrm{e}{\left(\mathrm{C}\mathrm{N}\right)}_6\right]}^{4-},{\left[\mathrm{R}\mathrm{u}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_6\right]}^{3+}$ and ${\left[\mathrm{C}\mathrm{r}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_6\right]}^{2+},$ is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The correct increasing order for the wavelengths of absorption in the visible region for the complexes of ${\mathrm{Co}}^{3+}$ is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Pick out the correct statement with respect to $\left[\mathrm{Mn}\right(\mathrm{CN}{)}_6{]}^{3-}.$ 

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The degenerate orbitals of ${\left[\mathrm{C}\mathrm{r}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ are

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The complex that has highest crystal field splitting energy $\left(∆\right)$ , is:

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Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The complex ion that will lose its crystal field stabilization energy upon oxidation of metal to $+3$ state is:

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

What is the correct electronic configuration of the central atom in ${\mathrm{K}}_4\left[\mathrm{F}\mathrm{e}{\left(\mathrm{C}\mathrm{N}\right)}_6\right]$ based on crystal field theroy?

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Complete removal of both the axial ligands (along the $\mathrm{z}-\mathrm{a}\mathrm{x}\mathrm{i}\mathrm{s}$ ) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The incorrect statement is.

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Three complexes,
${\left[\mathrm{C}\mathrm{o}\mathrm{C}\mathrm{l}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_5\right]}^{2+}\left(\mathrm{I}\right),\mathrm{ }\mathrm{ }{\left[\mathrm{C}\mathrm{o}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_5{\mathrm{H}}_2\mathrm{O}\right]}^{3+}\left(\mathrm{I}\mathrm{I}\right)$ and ${\left[\mathrm{C}\mathrm{o}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_6\right]}^{3+}\left(\mathrm{I}\mathrm{I}\mathrm{I}\right)$
absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The energies of ${\mathrm{d}}_{\mathrm{xy}}\mathrm{ }\mathrm{and}\mathrm{ }{\mathrm{d}}_{\mathrm{z}}^2$ orbitals in octahedral and tetrahedral transition metal complexes are such that

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

The correct increasing order of trans-effect of the following species is

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Colours in Coordination Compounds

Which of the following complex ions has electrons that are symmetrically filled in both ${\mathrm{t}}_{2\mathrm{g}}$ and ${\mathrm{e}}_{\mathrm{g}}$ orbitals?