Coordination Compounds — JEE Main PYQs

Given below are two statements:

Statement I: Among $[\mathrm{Cu}({\mathrm{NH}}_3{)}_4{]}^{2+}$, $[\mathrm{Ni}(\mathrm{en}{)}_3{]}^{2+}$, $[\mathrm{Ni}({\mathrm{NH}}_3{)}_6{]}^{2+}$ and $[\mathrm{Mn}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$, …

Consider the transition metal ions ${\mathrm{Mn}}^{3+},{\mathrm{Cr}}^{3+},{\mathrm{Fe}}^{3+}$ and ${\mathrm{Co}}^{3+}$ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

A first row transition metla (M) does not liberate ${\mathrm{H}}_2$ gas from dilute HCl .1 mol of aqueous solution of ${\mathrm{MSO}}_4$ is treated with excess of aqueous KCN and then ${\mathrm{H}}_2\mathrm{S}(\mathrm{g})$ is passed through the solution. The amount of MS …

Given below are two statements:

Statement I: Crystal Field Stabilization Energy (CFSE) of ${\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ is greater than that of ${\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$.

Statement II: Pot …

Identify the metal ions among ${\mathrm{Co}}^{2+}$, ${\mathrm{Ni}}^{2+}$, ${\mathrm{Fe}}^{2+}$, ${\mathrm{V}}^{3+}$ and ${\mathrm{Ti}}^{2+}$ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by thos …

$[\mathrm{Ni}({\mathrm{PPh}}_3{)}_2{\mathrm{Cl}}_2]$ is a paramagnetic complex. Identify the INCORRECT statements about this complex.
A. The complex exhibits geometrical isomerism.
B. The complex is white in colour.
C. The calculated spin-only magnetic moment of the complex is 2. …

Given below are two statements :

Statement I: ${\left[{\mathrm{CoBr}}_4\right]}^{2-}$ ion will absorb light of lower energy than ${\left[{\mathrm{CoCl}}_4\right]}^{2-}$ ion.
Statement II : In ${\left[{\mathrm{CoI}}_4\right]}^{2-}$ ion, the energy separation between the two set of d-or …

The statements that are incorrect about the nickel
(II) complex of dimethylglyoxime are :
A. It is red in colour
B. It has a high solubility in water at $\mathrm{pH}=9$
C. The Ni ion has two unpaired d-electrons
D. The $\mathrm{N}-\mathrm{Ni}-\mathrm{N}$ bond angle is almost clos …

The crystal field splitting energy of ${\left[\mathrm{Co}(\mathrm{oxalate}){}_3\right]}^{3-}$ complex is 'n' times that of the ${\left[\mathrm{Cr}(\mathrm{oxalate}){}_3\right]}^{3-}$ complex. Here 'n' is ____ . [Assume ${\Delta }_0\gg P$ ]

Identify the CORRECT set of details from the following:
A. ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$: Inner orbital complex; ${\mathrm{d}}^2{\mathrm{sp}}^3$ hybridized
B. ${\left[{\mathrm{MnCl}}_6\right]}^{3-}$: Outer orbital complex; …

Total number of unpaired electrons present in the central metal atoms/ions of
$\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right],{\left[{\mathrm{NiCl}}_4\right]}^{2-},\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_2\right],{\left[\mathrm{Ni}\left({\mathrm{CN}}_4\right)\right]}^{2-}$ …

Given below are two statements :

Statement-I Hybridisation, shape and spin only magnetic moment of ${\mathrm{K}}_3\left[\mathrm{Co}{\left({\mathrm{CO}}_3\right)}_3\right]$ is ${\mathrm{sp}}^3{\mathrm{d}}^2$, octahedral and 4.9 BM respectively.

Statement-II Geometry, hybri …

Consider a mixture ' X ' which is made by dissolving 0.4 mol of $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]\mathrm{Br}$ and 0.4 mol of $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Br}\right]{\mathrm{SO}}_4$ in water to make 4 L of …

Given below are two statements

Statements-I : The number of paramagnetic species among ${\left[{\mathrm{CoF}}_6\right]}^{3-},{\left[{\mathrm{TiF}}_6\right]}^{3-},{\mathrm{V}}_2{\mathrm{O}}_5$ and ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$ is 3 .
Statement-II …

The wavelength of light absorbed for the following complexes are in the order.
${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$; ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$; ${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$; …

A chromium complex with a formula ${\mathrm{CrCl}}_3\cdot 6{\mathrm{H}}_2\mathrm{O}$ has a spin only magnetic moment value of 3.87 BM and its solution conductivity corresponds to 1:2 electrolyte. 2.75 g of the complex solution was initially passed through a cation exchanger. T …

The correct statement among the following is:

X is the number of geometrical isomers exhibited by $[\mathrm{Pt}(\mathrm{NH}{}_3)(\mathrm{H}{}_2\mathrm{O})\mathrm{BrCl}]$.

Y is the number of optically inactive isomer(s) exhibited by $[\mathrm{CrCl}{}_2(\mathrm{ox}){}_2{]}^{3-}$
Z is the number of geometrical isomers exhibited by $[\mathrm{Co}(\mathrm{NH}{}_3){}_3(\mathrm{NO}{}_2){}_3]$
The value of …

The correct increasing order of spin-only magnetic moment values of the complex ions
$[{\mathrm{MnBr}}_4{]}^{2-}$(A), $[\mathrm{Cu}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$(B), $[\mathrm{Ni}({\mathrm{CN}}_4){]}^{2-}$(C) and $[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$(D) is:

The number of isoelectronic species among ${\mathrm{Sc}}^{3+}$, ${\mathrm{Cr}}^{2+}$, ${\mathrm{Mn}}^{3+}$, ${\mathrm{Co}}^{3+}$ and ${\mathrm{Fe}}^{3+}$ is 'n'. If 'n' moles of AgCl is formed during the reaction of complex with formula ${\mathrm{CoCl}}_3(\mathrm{en}{)}_2{\mathrm{NH}}_3$ w …

Match List - I with List - II.

List - I: Chromium (III) Complexes ($\mathbf{en}=\mathbf{ethylene}$ diamine)
List - II: ${\mathbf{\Delta }}_0\left({\mathbf{cm}}^{-1}\right)$

Choose the correct answer from the options given below :

5.33 g of ${\mathrm{CrCl}}_3\cdot 6{\mathrm{H}}_2\mathrm{O}$, which is a $1:3$ electrolyte, is dissolved in water and is passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with ${\mathrm{AgNO}}_3$ results in 8.61 g of AgCl. The ratio of m …

Which of the following complexes will show coordination isomerism?
(A) $[\mathrm{Ag}(\mathrm{NH}{}_3){}_2][\mathrm{Ag}(\mathrm{CN}){}_2]$
(B) $[\mathrm{Co}(\mathrm{NH}{}_3){}_6][\mathrm{Cr}(\mathrm{CN}){}_6]$
(C) $[\mathrm{Co}(\mathrm{NH}{}_3){}_6][\mathrm{Co}(\mathrm{CN}){}_6]$
(D) $[\mathrm{Fe}(\mathrm{NH}{}_3){}_6][\mathrm{Co}(\mathrm{CN}){}_6]$
(E) $[\mathrm{Co}(\mathrm{NH}{}_3){}_6][\mathrm{Fe}(\mathrm{CN}){}_6]$

Choose the correct answer from t …

Consider the metal complexes [Ni(en)₃]²⁺ (A), [NiCl₄]²⁻ (B) and [Ni(NH₃)₆]²⁺ (C). Choose the CORRECT option by considering the number of unpaired electron present in (A), (B) and (C) respectively and the order of frequency of absorption.

The correct statements about metal carbonyls are
A. The metal-carbon bonds in metals carbonyls possess both $\sigma$ and $\pi$-character.
B. Due to synergic bonding interactions between metals and CO ligand the metal-carbon bond becomes weak.
C. The metal-carbon $\sigma$ bo …

Given below are two statements :
Statement I : Each electron in ${\mathrm{e}}_{\mathrm{g}}$ orbitals destabilizes the orbitals by $+0.6{\Delta }_0$ and each electron in the $t_{2g}$ orbitals stabilizes the orbitals by $-0.4{\Delta }_0$ in an octahedral field on the b …

Given below are two statements :

Statement-I : Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation.

Statement-II : …

Identify the correct statements from the following:
(A) ${\left[\mathrm{Fe}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$ is the most stable complex among …

The total number of unpaired electrons present in the d³, d⁴ (low spin) d⁵ (high spin), d⁶ (high spin) and d⁷ (low spin) octahedral complex systems is ____.

Which of the following are true about the energy of the given d-orbitals of a tetrahedral complex ?
A. $d_{xy}=d_{xz}>d_{x^2-y^2}$
B. ${\mathrm{d}}_{\mathrm{xy}}={\mathrm{d}}_{\mathrm{yz}}>{\mathrm{d}}_{{\mathrm{z}}^2}$
C. $d_{x^2-y^2}>d_{z^2}>d_{xz}$
D. …

Which of the following sequence of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ?
A. $[{\mathrm{NiCl}}_4{]}^{2-}-{\mathrm{sp}}^3$, tetrahedral, paramagnetic
B. …

An excess of AgNO₃ is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles of AgCl precipitated will be _____ × 10⁻³. (Nearest integer)

Number of paramagnetic complexes among the following is ____.
${\left[{\mathrm{MnBr}}_4\right]}^{2-}$, ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$, ${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$, $\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$, ${\left[{\mathrm{CoF}}_6\right]}^{3-}$, …

In which of the following complexes the CFSE, ${\Delta }_0$ will be equal to zero?

From the magnetic behaviour of ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$ (paramagnetic) and $\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$ (diamagnetic), choose the correct geometry and oxidation state.

The correct order of the following complexes in terms of their crystal field stabilization energies is :

Identify the homoleptic complex(es) that is/are low spin.
(A) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NO}\right]}^{2-}$
(B) ${\left[{\mathrm{CoF}}_6\right]}^{3-}$
(C) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}$
(D) …

The complex of ${\mathrm{Ni}}^{2+}$ ion and dimethyl glyoxime contains ____ number of Hydrogen (H) atoms.

One mole of the octahedral complex compound $\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{Cl}}_3$ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of ${\mathrm{AgNO}}_3$ solution to yield two moles of …

Match List-I with List-II.

\begin{tabular}{ll}
\begin{tabular}{l}
List-I \\
(Transition metal ion)
\end{tabular} & \begin{tabular}{l}
List-II \\
(Spin only magnetic moment)
\end{tabular} \\
(A) ${\mathrm{Ti}}^{3+}$ & (I) 3.87 \\
(B) ${\mathrm{V}}^{2+}$ & (II) 0.00 \\
(C) …

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be :

The conditions and consequence that favours the ${\mathrm{t}}_{2\mathrm{g}}{}^3,{\mathrm{e}}_{\mathrm{g}}{}^1$ configuration in a metal complex are :

The complex that shows Facial - Meridional isomerism is

Identify the coordination complexes in which the central metal ion has ${\mathrm{d}}^4$ configuration.
(A) ${\left[{\mathrm{FeO}}_4\right]}^{2-}$
(B) ${\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{3-}$
(C) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$
(D) (see structure)
(E) …

Match List-I with List-II.

List-I (Complex):
(A) ${\left[{\mathrm{CoF}}_6\right]}^{3-}$
(B) ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$
(C) ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$
(D) ${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$

List-II (Hybridisatio …

Total number of molecules/species from following which will be paramagnetic is ____.
${\mathrm{O}}_2,{\mathrm{O}}_2^{+},{\mathrm{O}}_2^{-},\mathrm{NO},{\mathrm{NO}}_2,\mathrm{CO},{\mathrm{K}}_2[{\mathrm{NiCl}}_4]$, …

The correct increasing order of stability of the complexes based on ${\Delta }_{\mathrm{o}}$ value is :
(I) ${\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{3-}$
(II) ${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{4-}$
(III) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}$
(IV) …

The calculated spin-only magnetic moments of ${\mathrm{K}}_3\left[\mathrm{Fe}(\mathrm{OH}{)}_6\right]$ and ${\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{OH}{)}_6\right]$ respectively are :

Identify the homoleptic complexes with odd number of d electrons in the central metal.
(A) ${\left[{\mathrm{FeO}}_4\right]}^{2-}$
(B) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$
(C) ${\left[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NO}\right]}^{2-}$
(D) …

Consider the following low-spin complexes
${\mathrm{K}}_3\left[\mathrm{Co}{\left({\mathrm{NO}}_2\right)}_6\right],{\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right],{\mathrm{K}}_3\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$, …