Coordination Compounds — JEE Main PYQs

Total number of moles of AgCl precipitated on addition of excess of ${\mathrm{AgNO}}_3$ to one mole each of the following complexes $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]\mathrm{Cl}$, …

Chiral complex from the following is :

Here en = ethylene diamine

The sum of bridging carbonyls in $\mathrm{W}(\mathrm{CO}{)}_6$ and ${\mathrm{Mn}}_2(\mathrm{CO}{)}_{10}$ is ______.

Correct order of spin only magnetic moment of the following complex ions is:
(Given At. No. Fe: 26, Co:27)

The denticity of the ligand present in the Fehling's reagent is $\_\_\_\_$.

Which of the following is correct order of ligand field strength?

To inhibit the growth of tumours, identify the compounds used from the following:
(A) EDTA
(B) Coordination Compounds of Pt
(C) D - Penicillamine
(D) Cis-Platin

Choose the correct answer from the option given below:

The complex cation which has two isomers is :

The spin only magnetic moment of ${\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ complexes is ______ B.M. (Nearest integer)
(Given: Atomic no. of Mn is 25)

If the CFSE of ${\left[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ is $-96.0\mathrm{kJ}/\mathrm{mol}$, this complex will absorb maximum at wavelength ____ nm. (nearest integer)
Assume Planck's constant $(\mathrm{h})=6.4\times 10^{-34}$ Js Speed …

The $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ bond angle values in a fac$[\mathrm{Co}({\mathrm{NH}}_3{)}_3{\mathrm{Cl}}_3]$ complex is/are:

$1\mathrm{L}$, $0.02\mathrm{M}$ solution of $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]\mathrm{Br}$ is mixed with $1\mathrm{L}$, $0.02\mathrm{M}$ solution of …

Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on treating with cone HCl forms deep blue complex, Y which has a Z geometry. $\mathrm{X},\mathrm{Y}$ and Z , respectively, are

Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum structural distortion?
(en-ethylenediamine; ${\mathrm{H}}_2\mathrm{N}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NH}}_2$ )

Sum of oxidation state (magnitude) and coordination number of cobalt in $\mathrm{Na}[\mathrm{Co}(\text{bpy}){\mathrm{Cl}}_4]$ is ____.
(Given bpy =

Total number of relatively more stable isomer(s) possible for octahedral complex $[\text{Cu}(\text{en}{)}_2(\text{SCN}{)}_2]$ will be $\_\_\_\_$.

The conductivity of a solution of complex with formula ${\mathrm{CoCl}}_3{\left({\mathrm{NH}}_3\right)}_4$ corresponds to $1:1$ electrolyte, then the primary valency of central metal ion is ____

Consider the following metal complexes:
${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$
${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}$
${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$ …

The metal complex that is diamagnetic is (Atomic number : Fe, 26; Cu, 29)

Low oxidation state of metals in their complexes are common when ligands:

${\mathrm{Fe}}^{3+}$ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:

The correct order of energy of absorption for the following metal complexes is
A: ${\left[\mathrm{Ni}(\mathrm{en}{)}_3\right]}^{2+}$, B:${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$, C:${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

The difference between spin only magnetic moment values of $\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_3$ is ______.

$[\mathrm{Fe}(\mathrm{CN}){}_6{]}^{4-}$
$[\mathrm{Fe}(\mathrm{CN}){}_6{]}^{3-}$
$[\mathrm{Ti}(\mathrm{CN}){}_6{]}^{3-}$
$[\mathrm{Ni}(\mathrm{CN}){}_4{]}^{2-}$
$[\mathrm{Co}(\mathrm{CN}){}_6{]}^{3-}$

Among the given complexes, number of paramagnetic complexes is ______.

(a) $\mathrm{CoCl}{}_3\cdot 4\mathrm{NH}{}_3$
(b) $\mathrm{CoCl}{}_3\cdot 5\mathrm{NH}{}_3$
(c) $\mathrm{CoCl}{}_3\cdot 6\mathrm{NH}{}_3$ and
(d) $\mathrm{CoCl}(\mathrm{NO}{}_3){}_2\cdot 5\mathrm{NH}{}_3$

Number of complex(es) which will exist in cis-trans is/are

Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: $\mathrm{Mn}=25;\mathrm{Fe}=26$)
(A) ${\left[{\mathrm{FeF}}_6\right]}^{3-}$
(B) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$
(C) ${\left[{\mathrm{MnCl}}_6\right]}^{3-}$ (h …

Given below are two statements:
Statement I: $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$ is square planar and diamagnetic complex with ${\mathrm{dsp}}^2$ hybridization for Ni but $[\mathrm{Ni}(\mathrm{CO}{)}_4]$ is tetrahedral, paramagnetic and with ${\mathrm{sp}}^3$-hybridization for Ni …

Number of complexes which will exhibit synergic bonding amongst, $[\mathrm{Cr}(\mathrm{CO}{)}_6]$, $[\mathrm{Mn}(\mathrm{CO}{)}_5]$ and $[{\mathrm{Mn}}_2(\mathrm{CO}{)}_{10}]$ is ______.

Given below are two statements.

Statement I: In $\mathrm{CuSO}{}_4\cdot 5\mathrm{H}{}_2\mathrm{O}$, Cu-O bonds are present.

Statement II: In $\mathrm{CuSO}{}_4\cdot 5\mathrm{H}{}_2\mathrm{O}$, ligands coordinating with Cu(II) ion are O- and S-based ligands.

In the light of the above statements, choose the correct answer from the options give …

Spin only magnetic moment of ${\left[{\mathrm{MnBr}}_6\right]}^{4-}$ is ____
B.M. (round off to the closest integer)

For the reaction given below:
${\mathrm{CoCl}}_3.{\mathrm{xNH}}_3+{\mathrm{AgNO}}_3(\mathrm{aq})\to$
If two equivalents of AgCl precipitate out, then the value of $x$ will be ____.

Reaction of $[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in $t_{2g}$-orbitals of the product is $\_\_\_\_$.

The spin-only magnetic moment value of an octahedral complex among ${\mathrm{CoCl}}_3\cdot 4{\mathrm{NH}}_3$, ${\mathrm{NiCl}}_2\cdot 6{\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{PtCl}}_4\cdot 2\mathrm{HCl}$, which upon reaction with excess of ${\mathrm{AgNO}}_3$ gives 2 moles of AgC …

Which of the following will have maximum stabilization due to crystal field?

The number of statement(s) correct from the following for copper (at no. 29) is/are ____
(A) Cu (II) complexes are always paramagnetic
(B) $\mathrm{Cu}(\mathrm{I})$ complexes are generally colourless
(C) $\mathrm{Cu}(\mathrm{I})$ is easily oxidized
(D) In Fehling solution …

[Fe(CN)₆]³⁻ should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is (-) ____ Δₒ. (Nearest integer)

In the cobalt-carbonyl complex: $\left[{\mathrm{Co}}_2(\mathrm{CO}{)}_8\right]$, number of $\mathrm{Co}-\mathrm{Co}$ bonds is "X" and terminal CO ligands is "Y". $\mathrm{X}+\mathrm{Y}=$ ______

Transition metal complex with highest value of crystal field splitting ( ${\Delta }_0$ ) will be

Amongst ${\mathrm{FeCl}}_3.3{\mathrm{H}}_2\mathrm{O}$, ${\mathrm{K}}_3[\mathrm{Fe}(\mathrm{CN}{)}_6]$ and $[\mathrm{Co}({\mathrm{NH}}_3{)}_6]{\mathrm{Cl}}_3$, the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wavelength is ______ B.M. …

White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of :

If ${\left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{2+}$ absorbs a light of wavelength 600 nm for $\mathrm{d}-\mathrm{d}$ transition, then the value of octahedral crystal field splitting energy for …

The stepwise formation of ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$ is given below:
${\mathrm{Cu}}^{2+}+{\mathrm{NH}}_3\stackrel{{\mathrm{K}}_1}{=}{\left[\mathrm{Cu}\left({\mathrm{NH}}_3\right)\right]}^{2+}$ …

Which one of the following complexes is violet in colour?

The ratio of number of water molecules in Mohr's salt and potash alum is ____ $\times 10^{-1}$
(Integer answer)

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.
Complexes: …

Indicate the complex / complex ion which did not show any geometrical isomerism:

The overall stability constant of the complex ion ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$ is $2.1\times 10^{13}$. The overall dissociation constant is $\mathrm{y}\times 10^{-14}$. Then y is $\_\_\_\_$. (Nearest integer)

According to the valence bond theory the hybridization of central metal atom is ${\mathrm{dsp}}^2$ for which one of the following compounds?

The correct order of intensity of colors of the compounds is:

The spin only magnetic moment value for the complex $[\mathrm{Co}(\mathrm{CN}{)}_6{]}^{4-}$ is ____ BM.
[At. No. of $\mathrm{Co}=27$]