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The number of unpaired electrons in the complex ion $[{CoF}_{6}]^{3 -}$ is
(Atomic no : Co = $27$ )

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Important Questions on Coordination Compounds

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

When concentrated

HCl

is added to aqueous solution of

C o C 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>Crystal Field Theory

The complex that has highest crystal field splitting energy

(∆)

, is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The octahedral complex of a metal ion

M^{3 +}

with four monodentate ligands

L_{1}, L_{2}, L_{3} and 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>Crystal Field Theory

Which of the following complex ions has electrons that are symmetrically filled in both

t_{2 g}

and

e_{g}

orbitals?

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

{[F e {(C N)}_{6}]}^{4 -}

and

{[F e {(H_{2} O)}_{6}]}^{2 +}

are of different colours in dilute solutions. Why?

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

What is the correct electronic configuration of the central atom in

K_{4} [F e {(C N)}_{6}]

based on crystal field theroy?

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

In aqueous solution,

{[Co {(H_{2} O)}_{6}]}^{2 +} (X)

reacts with molecular oxygen in the presence of excess

{NH}_{3}

to give a new complex

Y .

The number of unpaired electrons in

X

and

Y

are, respectively

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Complete removal of both the axial ligands (along the

z - a x i s

) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The correct increasing order for the wavelengths of absorption in the visible region for the complexes of

{Co}^{3 +}

is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Pick out the correct statement with respect to

[Mn (CN)_{6}]^{3 -} .

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The calculated spin-only magnetic moments

(B M)

of the anionic and cationic species out of

{[Fe {(H_{2} O)}_{6}]}^{+ 2}

and

{[Fe {(CN)}_{6}]}^{4 -}

respectively, are:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

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

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The degenerate orbitals of

{[C r {(H_{2} O)}_{6}]}^{3 +}

are

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Identify the correct trend given below:

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

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The complex ion that will lose its crystal field stabilization energy upon oxidation of metal to

+ 3

state is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Three complexes,

{[C o C l {(N H_{3})}_{5}]}^{2 +} (I), {[C o {(N H_{3})}_{5} H_{2} O]}^{3 +} (I I)

and

{[C o {(N H_{3})}_{6}]}^{3 +} (I I I)

absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The correct order of the spin –only magnetic moment of metal ions in the following low-spin complexes,

{[V {(C N)}_{6}]}^{4 -}, {[F e {(C N)}_{6}]}^{4 -}, {[R u {(N H_{3})}_{6}]}^{3 +}

and

{[C r {(N H_{3})}_{6}]}^{2 +},

is:

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The energies of

d_{xy} and d_{z}^{2}

orbitals in octahedral and tetrahedral transition metal complexes are such that

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

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

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Homoleptic octahedral complexes of a metal ion

' M^{3 +}'

with three monodentate ligands

L_{1}, L_{2} a n d L_{3}

absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is:

The number of unpaired electrons in the complex ion[CoF6]3− is (Atomic no : Co =27)

Important Questions on Coordination Compounds

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The number of unpaired electrons in the complex ion $[{CoF}_{6}]^{3 -}$ is
(Atomic no : Co = $27$ )