Coordination Compounds — JEE Main PYQs

Given below are two statements :

Statement (I) : In octahedral complexes, when ${\Delta }_{\mathrm{o}}<\mathrm{P}$ high spin complexes are formed. When ${\Delta }_{\mathrm{o}}>\mathrm{P}$ low spin complexes are formed.
Statement (II) : In tetrahedral complexes because of …

A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential ( ${\mathrm{M}}^{3+}/{\mathrm{M}}^{2+}$ ). It forms a metal complex of the type ${\left[\mathrm{M}(\mathrm{CN}{)}_6\right]}^{4-}$. The number of electrons present in the …

The d-orbital electronic configuration of the complex among ${\left[\mathrm{Co}(\mathrm{en}{)}_3\right]}^{3+},{\left[{\mathrm{CoF}}_6\right]}^{3-},{\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and …

The type of hybridization and the magnetic property of ${\left[{\mathrm{MnCl}}_6\right]}^{3-}$ are :

The correct order of the complexes ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{H}}_2\mathrm{O}\right)\right]}^{3+}$ (A), ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$ (B), ${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$ (C) and …

The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is _____.
FeCl3 + KOH + H2C2O4 -> A

The correct order of ${\left[{\mathrm{FeF}}_6\right]}^{3-},{\left[{\mathrm{CoF}}_6\right]}^{3-},\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$ and ${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$ complex species based on the number of unpaired electrons present is :

'X' is the number of electrons in ${\mathrm{t}}_{2g}$ orbitals of the most stable complex ion among $[\mathrm{Fe}({\mathrm{NH}}_3{)}_6{]}^{3+}$, $[\mathrm{Fe}({\mathrm{Cl}}_6){]}^{3-}$, $[\mathrm{Fe}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$ and $[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}$. The n …

A metal complex with a formula ${\mathrm{MCl}}_4\cdot 3{\mathrm{NH}}_3$ is involved in ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridisation. It upon reaction with excess of ${\mathrm{AgNO}}_3$ solution gives 'x' moles of AgCl. Consider 'x' is equal to the number of lone pairs of electron present …

Which one of the following complexes will have ${\Delta }_0=0$ and $\mu =5.96$ B.M.?

Number of stereoisomers possible for the complexes, $\left[{\mathrm{CrCl}}_3(\mathrm{py}{)}_3\right]$ and ${\left[{\mathrm{CrCl}}_2(\mathrm{ox}{)}_2\right]}^{3-}$ are respectively
(py = pyridine, ox = oxalate)

' X ' is the number of acidic oxides among ${\mathrm{VO}}_2$, ${\mathrm{V}}_2{\mathrm{O}}_3,{\mathrm{CrO}}_3,{\mathrm{V}}_2{\mathrm{O}}_5$ and ${\mathrm{Mn}}_2{\mathrm{O}}_7$. The primary valency of cobalt in …

Match List-I with List-II
| (B) …

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : …

The number of paramagnetic metal complex species among ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+},{\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$, …

An octahedral complex having molecular composition $\mathrm{Co}.5{\mathrm{NH}}_3.\mathrm{Cl}.{\mathrm{SO}}_4$ has two isomers A and B . The solution of A gives a white precipitate with ${\mathrm{AgNO}}_3$ solution and the solution of B gives white precipitate with …

The number of paramagnetic complex among $[{\mathrm{FeF}}_6{]}^{3-},[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-},[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-},[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$, $[{\mathrm{MnCl}}_6{]}^{3-}$ and $[{\mathrm{CoF}}_6{]}^{3-}$, which involved …

Given below are two statements :
Statement I: A homolepitc octahedral complex, formed using monodentate ligands, will not show stereoisomerism.
Statement II : cis- and trans- platin are heteroleptic complexes of Pd.
In the light of the above statements, choose the correct answer …

The correct decreasing order of spin only magnetic moment values (BM) of ${\mathrm{Cu}}^{+},{\mathrm{Cu}}^{2+},{\mathrm{Cr}}^{2+}$ and ${\mathrm{Cr}}^{3+}$ ions is :

The number of species from the following that are involved in ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridization is
$[\mathrm{Co}({\mathrm{NH}}_3{)}_6{]}^{3+}$, ${\mathrm{SF}}_6$, $[{\mathrm{CrF}}_6{]}^{3-}$, $[{\mathrm{CoF}}_6{]}^{3-}$, $[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}$ and $[{\mathrm{MnCl}}_6{]}^{3-}$

Identify the diamagnetic octahedral complex ions from below ;
A. $[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}$
B. $[\mathrm{Co}({\mathrm{NH}}_3{)}_6{]}^{3+}$
C. $[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{4-}$
D. $[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_3{\mathrm{F}}_3]$

Choose the correct answer …

Match the LIST-I with LIST-II:
LIST-I (Complex/Species): A. [Ni(CO)₄] B. [Ni(CN)₄]²⁻ C. [NiCl₄]²⁻ D. [MnBr₄]²⁻
LIST-II (Shape & magnetic moment): I. Tetrahedral, 2.8 BM II. Square planar, 0 BM III. Tetrahedral, 0 BM IV. Tetrahedral, 5.9 BM
Choose the correct answer from …

Match List-I with List-II:
List-I (Complex): (A) [MnBr₄]²⁻ (B) [FeF₆]³⁻ (C) [Co(CO)₄]³⁻? [Co(C₂O₄)₃]³⁻ (D) [Ni(CO)₄]
List-II (Hybridisation & Magnetic character): (I) d²sp³ & diamagnetic (II) sp³d² & paramagnetic (III) sp³ & diamagnetic (IV) sp³ & paramagnetic
Choose the …

The correct sequence of ligands in the order of decreasing field strength is :

Number of complexes from the following with even number of unpaired "d" electrons is ____. …

If an iron (III) complex with the formula ${\left[\mathrm{Fe}{\left({\mathrm{NH}}_3\right)}_{\mathrm{x}}(\mathrm{CN}{)}_{\mathrm{y}}\right]}^{-}$has no electron in its ${\mathrm{e}}_{\mathrm{g}}$ orbital, then the value of $\mathrm{x}+\mathrm{y}$ is

The number of unpaired d-electrons in ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ is

Which one of the following complexes will exhibit the least paramagnetic behaviour ?
[Atomic number, $\mathrm{Cr}=24,\mathrm{Mn}=25,\mathrm{Fe}=26,\mathrm{Co}=27$ ]

The correct order of ligands arranged in increasing field strength.

The metal atom present in the complex MABXL (where $\mathrm{A},\mathrm{B},\mathrm{X}$ and L are unidentate ligands and M is metal) involves ${\mathrm{sp}}^3$ hybridization. The number of geometrical isomers exhibited by the complex is:

The number of complexes from the following with no electrons in the ${\mathrm{t}}_2$ orbital is ____.
${\mathrm{TiCl}}_4,{\left[{\mathrm{MnO}}_4\right]}^{-},{\left[{\mathrm{FeO}}_4\right]}^{2-},{\left[{\mathrm{FeCl}}_4\right]}^{-},{\left[{\mathrm{CoCl}}_4\right]}^{2-}$

Consider the following complexes.
${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}$,
${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$,
(A)
(B)
${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{H}}_2\mathrm{O}\right)\right]}^{3+}$, …

The correct IUPAC name of $\left[{\mathrm{PtBr}}_2{\left({\mathrm{PMe}}_3\right)}_2\right]$ is:

Match List-I with List-II

List-I (Tetrahedral Complex)

(A) ${\mathrm{TiCl}}_4$

(B) ${\left[{\mathrm{FeO}}_4\right]}^{2-}$

(C) ${\left[{\mathrm{FeCl}}_4\right]}^{-}$

(D) ${\left[{\mathrm{CoCl}}_4\right]}^{2-}$

List-II (Electronic configuration)

(I) …

Match List-I with List-II.

List-I
(Complex ion)

List-II
(Spin only magnetic
moment in B.M.)

(A) ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$
(B) ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$
(C) ${\left[{\mathrm{CoF}}_6\right]}^{3-}$
(D) …

Total number of unpaired electrons in the complex ion $[\mathrm{Co}(\mathrm{NH}{}_3){}_6{]}^{3+}$ and $[\mathrm{NiCl}{}_4{]}^{2-}$ is

An octahedral complex with the formula ${\mathrm{CoCl}}_3{\mathrm{nNH}}_3$ upon reaction with excess of ${\mathrm{AgNO}}_3$ solution given 2 moles of AgCl . Consider the oxidation state of Co in the complex is ' x '. The value of " $\mathrm{x}+\mathrm{n}$ " is ______。

Given below are two statements:

Statement I: $\mathrm{N}{\left({\mathrm{CH}}_3\right)}_3$ and $\mathrm{P}{\left({\mathrm{CH}}_3\right)}_3$ can act as ligands to form transition metal complexes.
Statement II: As N and P are from same group, the nature of bonding of …

Number of complexes with even number of electrons in ${\mathrm{t}}_{2\mathrm{g}}$ orbitals is - …

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The total number of geometrical isomers shown by ${\left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]}^{+}$complex ion is three
Reason (R): …

Number of ambidentate ligands among the following is ____.
${\mathrm{NO}}_2^{-},{\mathrm{SCN}}^{-},{\mathrm{C}}_2{\mathrm{O}}_4^{2-},{\mathrm{NH}}_3,{\mathrm{CN}}^{-},{\mathrm{SO}}_4^{2-},{\mathrm{H}}_2\mathrm{O}$.

The coordination environment of ${\mathrm{Ca}}^{2+}$ ion in its complex with EDTA ${}^{4-}$ is :

Consider the following test for a group-IV cation.
${\mathrm{M}}^{2+}+{\mathrm{H}}_2\mathrm{S}\to \mathrm{A}$ (Black precipitate) + byproduct
$\mathrm{A}+$ aqua regia $\to \mathrm{B}+\mathrm{NOCl}+\mathrm{S}+{\mathrm{H}}_2\mathrm{O}$ …

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :

[Co(NH₃)₆]³⁺ and [CoF₆]³⁻ are respectively known as:

Given below are two statements:

Statement (I): Dimethyl glyoxime forms a six-membered covalent chelate when treated with NiCl₂ solution in presence of NH₄OH.
Statement (II): Prussian blue precipitate contains iron both in (+2) and (+3) oxidation states.

In the light of the abov …

Given below are two statements:

Statement (I): A solution of ${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ is green in colour.
Statement (II): A solution of ${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$ is colourless.

In the light of the above sta …

Which of the following complex is homoleptic?

Identify from the following species in which ${\mathrm{d}}^2{\mathrm{sp}}^3$ hybridization is shown by central atom:

The Spin only magnetic moment value of square planar complex $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2\mathrm{Cl}\left({\mathrm{NH}}_2{\mathrm{CH}}_3\right)\right]\mathrm{Cl}$ is
____ B.M. (Nearest integer)
(Given atomic number for $\mathrm{Pt}=78$)