Core Syllabus Module

Coordination Compounds

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Nomenclature, Isomerism, Importance and Werner's Theory

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Bonding and Crystal field

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Chapter Elite-20 Challenge Zone

Target Advanced

JEE Advanced 2017

LEVELJEE Advanced

Addition of excess aqueous ammonia to a pink coloured aqueous solution of MCl_2. 6H_2O (X) and NH_4Cl gives an octahedral complex Y in the presence of air. In aqueous solution, complex Y behaves as 1 : 3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M., whereas it is zero for complex Y. Among the following options, which statements is(are) correct ?

* Multiple Correct Options

(A)

The hybridization of the central metal ion in Y is

d^{2} s p^{3}

(B)

Z is tetrahedral complex

(C)

Addition of silver nitrate to Y gives only two equivalents of silver chloride

(D)

When X and Z are in equilibrium at

0^{\circ} C

, the colour of the solution is pink

JEE Main 2014

LEVELJEE Advanced

A list of species having the formula $XZ_{4}$ is given below : $XeF_{4}$ , $SF_{4}$ , $SiF_{4}$ , $BF_{4}^{-}$ , $BrF_{4}^{-}$ , $[Cu (NH_{3})_{4}]^{2 +}$ , $[FeCl_{4}]^{2 -}$ , $[CoCl_{4}]^{2 -}$ and $[PtCl_{4}]^{2 -}$ . Defining shape on the basis of the location of X and Z atoms, the total number of species having a square planar shape is

JEE Advanced 2026

LEVELJEE Advanced

The total number of all possible isomers for the square planar complex with formula $K [M (N C S) (N O_{2}) (g l y)]$ is ______ ( $M =$ metal ion and $g l y = N H_{2} C H_{2} C O O^{-}$ )

JEE Advanced 2022

LEVELJEE Advanced

LIST-I contains metal species and LIST-II contains their properties. [Given : Atomic number of $Cr = 24$ , $Ru = 44$ , $Fe = 26$ ] Match each metal species in LIST-I with their properties in LIST-II.

List-I

(P)

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

(Q)

[RuCl_{6}]^{2 -}

(R)

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

(S)

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

List-II

(1)

t_{2 g}

orbitals contain 4 electrons

(2)

μ (spin-only) = 4.9 BM

(3)

low spin complex ion

(4)

metal ion in 4+ oxidation state

(5)

d^{4}

species

JEE Advanced 2020

LEVELJEE Advanced

Choose the correct statement(s) among the following :

* Multiple Correct Options

(A)

[F e C l_{4}]^{-}

has tetrahedral geometry.

(B)

[C o (e n) (N H_{3})_{2} C l_{2}]^{+}

has 2 geometrical isomers.

(C)

[F e C l_{4}]^{-}

has higher spin-only magnetic moment than

[C o (e n) (N H_{3})_{2} C l_{2}]^{+}

(D)

The cobalt ion in

[C o (e n) (N H_{3})_{2} C l_{2}]^{+}

has

s p^{3} d^{2}

hybridization.

JEE Advanced 2016

LEVELJEE Advanced

The number of geometric isomers possible for the complex $[CoL_{2} Cl_{2}]^{-}$ ( $L = H_{2} NCH_{2} CH_{2} O^{-}$ ) is

JEE Advanced 2018

LEVELJEE Advanced

Match each set of hybrid orbitals from LIST-I with complex (es) given in LIST-II.

List-I

(P)

d s p^{2}

(Q)

s p^{3}

(R)

s p^{3} d^{2}

(S)

d^{2} s p^{3}

List-II

(1)

[F e F_{6}]^{4 -}

(2)

[T i (H_{2} O)_{3} C l_{3}]

(3)

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

(4)

[F e C l_{4}]^{2 -}

(5)

N i (C O)_{4}

(6)

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

JEE Advanced 2018

LEVELJEE Advanced

Among the species given below, the total number of diamagnetic species is____. $H atom, NO_{2} monomer, O_{2}^{-} (superoxide), dimeric sulphur in vapour phase, Mn_{3} O_{4}, (NH_{4})_{2} [FeCl_{4}], (NH_{4})_{2} [NiCl_{4}], K_{2} MnO_{4}, K_{2} CrO_{4}$

JEE Advanced 2018

LEVELJEE Advanced

The correct option(s) regarding the complex $[C o (e n) (N H_{3})_{3} (H_{2} O)]^{3 +}$ :- $(e n = H_{2} N C H_{2} C H_{2} N H_{2})$ is (are)

* Multiple Correct Options

(A)

It has two geometrical isomers

(B)

It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands

(C)

It is paramagnetic

(D)

It absorbs light at longer wavelength as compared to

[C o (e n) (N H_{3})_{4}]^{3 +}

JEE Main 2020

LEVELJEE Advanced

$[Pd(F)(Cl)(Br)(I)]^{2 -}$ has $n$ number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of $[Fe(CN)_{6}]^{n - 6}$ respectively, are [Note: Ignore the pairing energy]

(A)

1.73 BM

and

- 2.0 Δ_{o}

(B)

2.84 BM

and

- 1.6 Δ_{o}

(C)

0 BM

and

- 2.4 Δ_{o}

(D)

5.92 BM

and

0

JEE Main 2020

LEVELJEE Advanced

The correct order of the spin only magnetic moments of the following complexes is (I) $[Cr (H_{2} O)_{6}] Br_{2}$ (II) $Na_{4} [Fe (CN)_{6}]$ (III) $Na_{3} [Fe (C_{2} O_{4})_{3}] (Δ_{0} > P)$ (IV) $(Et_{4} N)_{2} [CoCl_{4}]$

(A)

(II)

\approx

(I) > (IV) > (III)

(B)

(I) > (IV) > (III) > (II)

(C)

(III) > (I) > (IV) > (II)

(D)

(III) > (I) > (II) > (IV)

JEE Main 2020

LEVELJEE Advanced

Complex $X$ of composition $Cr(H_{2} O)_{6} Cl_{n}$ has a spin only magnetic moment of $3.83 BM$ . It reacts with $AgNO_{3}$ and shows geometrical isomerism. The IUPAC nomenclature of $X$ is

(A)

tetraaquadichlorido chromium (IV) chloride dihydrate

(B)

hexaaqua chromium (III) chloride

(C)

dichloridotetraaqua - chromium (IV) chloride dihydrate

(D)

tetraaquadichlorido - chromium (III) chloride dihydrate

JEE Main 2020

LEVELJEE Advanced

Consider that a $d^{6}$ metal ion ( $M^{2 +}$ ) forms a complex with aqua ligands and the spin only magnetic moment of the complex is $4.90 BM$ . The geometry and the crystal field stabilisation energy of the complex is

(A)

tetrahedral and

- 1.6 Δ_{t} + 1 P

(B)

octahedral and

- 2.4 Δ_{0} + 2 P

(C)

octahedral and

- 1.6 Δ_{0}

(D)

tetrahedral and

- 0.6 Δ_{t}

JEE Main 2026

LEVELJEE Advanced

Consider that the coordinating atoms of the ligands in $c i s - [C o (N H_{3})_{4} C l_{2}] C l$ and $m er - [C o (N H_{3})_{3} C l_{3}]$ octahedral complexes are at the vertices of an octahedron. The sum of total number of the triangular faces in both the complexes having one N atom and two Cl atoms at their corners is ____.

JEE Advanced 2023

LEVELJEE Advanced

Match the electronic configurations in List-I with appropriate metal complex ions in List-II and choose the correct option. [Atomic Number: Fe = 26, Mn = 25, Co = 27]

List-I

(P)

t_{2 g}^{6} e_{g}^{0}

(Q)

t_{2 g}^{3} e_{g}^{2}

(R)

e^{2} t_{2}^{3}

(S)

t_{2 g}^{4} e_{g}^{2}

List-II

(1)

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

(2)

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

(3)

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

(4)

[F e C l_{4}]^{-}

(5)

[C o C l_{4}]^{2 -}

JEE Advanced 2014

LEVELJEE Advanced

Comprehension Passage

An aqueous solution of metal ion

M_{1}

reacts separately with reagents

Q

and

R

in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion

M_{2}

always forms tetrahedral complexes with these reagents. Aqueous solution of

M_{2}

on reaction with reagent

S

gives white precipitate which dissolves in excess of

S

. The reactions are summarized in the scheme given below.

Question 1:

$M_{1}$ , $Q$ and $R$ , respectively are

(A)

Zn^{2 +}

KCN

and

HCl

(B)

Ni^{2 +}

HCl

and

KCN

(C)

Cd^{2 +}

KCN

and

HCl

(D)

Co^{2 +}

HCl

and

KCN

Question 2:

Reagent $S$ is

(A)

K_{4} [Fe(CN)_{6}]

(B)

Na_{2} HPO_{4}

(C)

K_{2} CrO_{4}

(D)

KOH

JEE Advanced 2023

LEVELJEE Advanced

The complex(es), which can exhibit the type of isomerism shown by $[P t (N H_{3})_{2} B r_{2}]$ , is(are) $[e n = H_{2} N C H_{2} C H_{2} N H_{2}]$

* Multiple Correct Options

(A)

[P t (e n) (S C N)_{2}]

(B)

[Z n (N H_{3})_{2} C l_{2}]

(C)

[P t (N H_{3})_{2} C l_{4}]

(D)

[C r (e n)_{2} (H_{2} O) (S O_{4})]^{+}

JEE Advanced 2020

LEVELJEE Advanced

In an experiment, $m$ grams of a compound $X$ (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below. In the presence of a magnetic field, the pan with $X$ is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound $X$ . Identify the correct statement(s)

* Multiple Correct Options

(A)

X

H_{2} O (l)

, deflection of the pan is upwards.

(B)

X

K_{4} [Fe (CN)_{6}] (s)

, deflection of the pan is upwards.

(C)

X

O_{2} (g)

, deflection of the pan is downwards.

(D)

X

C_{6} H_{6} (l)

, deflection of the pan is downwards.

JEE Advanced 2021

LEVELJEE Advanced

The total number of possible isomers for $[Pt (NH_{3})_{4} Cl_{2}] Br_{2}$ is ______ .

JEE Advanced 2018

LEVELJEE Advanced

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers : Fe = 26, Ni = 28)

* Multiple Correct Options

(A)

Total number of valence shell electrons at metal centre in

Fe(CO)_{5}

Ni(CO)_{4}

16

(B)

These are predominantly low spin in nature

(C)

Metal - carbon bond strengthens when the oxidation state of the metal is lowered

(D)

The carbonyl

C-O

bond weakens when the oxidation state of the metal is increased

Micro-Topic Strategy Matrix

Nomenclature, Isomerism, Importance and Werner's Theory

Bonding and Crystal field

Chapter Elite-20 Challenge Zone

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The total number of all possible isomers for the square planar complex with formula K[M(NCS)(NO2​)(gly)] is ______ (M= metal ion and gly=NH2​CH2​COO−)

List-I

List-II

Choose the correct statement(s) among the following :

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of geometric isomers possible for the complex [CoL2​Cl2​]− (L=H2​NCH2​CH2​O−) is

Match each set of hybrid orbitals from LIST-I with complex (es) given in LIST-II.

List-I

List-II

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct option(s) regarding the complex [Co(en)(NH3​)3​(H2​O)]3+ :- (en=H2​NCH2​CH2​NH2​) is (are)

Match the electronic configurations in List-I with appropriate metal complex ions in List-II and choose the correct option. [Atomic Number: Fe = 26, Mn = 25, Co = 27]

List-I

List-II

Comprehension Passage

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } M1​, Q and R, respectively are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Reagent S is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The complex(es), which can exhibit the type of isomerism shown by [Pt(NH3​)2​Br2​], is(are) [en=H2​NCH2​CH2​NH2​]

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The total number of possible isomers for [Pt(NH3​)4​Cl2​]Br2​ is ______ .

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers : Fe = 26, Ni = 28)

The total number of all possible isomers for the square planar complex with formula $K [M (N C S) (N O_{2}) (g l y)]$ is ______ ( $M =$ metal ion and $g l y = N H_{2} C H_{2} C O O^{-}$ )

The number of geometric isomers possible for the complex $[CoL_{2} Cl_{2}]^{-}$ ( $L = H_{2} NCH_{2} CH_{2} O^{-}$ ) is

The correct option(s) regarding the complex $[C o (e n) (N H_{3})_{3} (H_{2} O)]^{3 +}$ :- $(e n = H_{2} N C H_{2} C H_{2} N H_{2})$ is (are)

$M_{1}$ , $Q$ and $R$ , respectively are

Reagent $S$ is

The complex(es), which can exhibit the type of isomerism shown by $[P t (N H_{3})_{2} B r_{2}]$ , is(are) $[e n = H_{2} N C H_{2} C H_{2} N H_{2}]$

The total number of possible isomers for $[Pt (NH_{3})_{4} Cl_{2}] Br_{2}$ is ______ .