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The crystal field theory could not explain why anionic ligands are found at the low end of the spectrochemical series.

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Important Questions on Coordination Compounds

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The complex having the highest spin only magnetic moment is

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?

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The hybridisation of

Fe

K_{3} [Fe (CN)_{6}]

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Among the complexes of Ni listed below, the following is the only correct statement

I - $[Ni (CO)_{4}]$

II - ${[Ni (CN)_{4}]}^{- 2}$

III - ${[Ni ({Cl}_{4})]}^{- 2}$

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

The molecule in which hybrid

MOs

involve only one d-orbital of the central atom is :

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Select the correct statements

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

{[Fe {(H_{2} O_{2})}_{6}]}^{3 +}

is strongly paramagnetic whereas

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

is weakly paramagnetic. Select the correct statements based on crystal field theory from the following:

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Select the correct statements from the following

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Based on crystal field splitting theory select the correct statements.

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Which of the following are coloured ?

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

transition metal

M

forms an Octahedral complex. The calculated magnetic moment remains unaffected by the nature of ligand i.e. whether strong or weak. Select the correct statement -

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Give the oxidation state,

d

-orbital occupation and coordination number of the central metal ion in the following complex:

K_{3} [C o {(C_{2} O_{4})}_{3}]

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

What will be the correct order for the wavelengths of absorption in the visible region for the following:

{[N i {(N O_{2})}_{6}]}^{4 -}, {[N i {(N H_{3})}_{6}]}^{2 +}, {[N i {(H_{2} O)}_{6}]}^{2 +}

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

What is crystal field splitting energy? How does the magnitude of

∆_{o}

decide the actual configuration of

d

-orbitals in a coordination entity?

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}

and

L_{3}

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

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Aqueous copper sulphate solution (blue in colour) gives a green precipitate with aqueous potassium fluoride. Explain the experimental results.

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Match the following:

Column – I	Column - II
$A . {sp}^{3}$	$(i) {[Co {({NH}_{3})}_{6}]}^{3 +}$
$B . {dsp}^{2}$	$(ii) [Ni {(CO)}_{4}]$
$C . {sp}^{3} d^{2}$	$(iii) [Pt {({NH}_{3})}_{2} {Cl}_{2}]$
$D . d^{2} {sp}^{3}$	$(iv) {[{CoF}_{6}]}^{3 -}$

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

Draw figure to show the splitting of

d

orbitals in an octahedral crystal field.

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

What is the spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Crystal Field Theory

A solution of

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

is green but a solution of

{[N i {(C N)}_{4}]}^{2 -}

is colourless. Explain.

The crystal field theory could not explain why anionic ligands are found at the low end of the spectrochemical series.

Important Questions on Coordination Compounds

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