Chemistry chapters

Coordination Compounds

33 JEE Main questions · Chemistry

ChemistryJEE Main 21 Jan 2026, Shift 1·Q15·MCQ·Moderate
Open
Magnetic properties of complexes
Given below are two statements:
Statement I: Among $\ce{[Cu(NH3)4]^2+}$ , $\ce{[Ni(en)3]^2+}$ , $\ce{[Ni(NH3)6]^2+}$ and $\ce{[Mn(H2O)6]^2+}$ , $\ce{[Mn(H2O)6]^2+}$ , has the maximum number of unpaired electrons.
Statement II: The number of pairs among { $\ce{[NiCl4]^2-}$ , $\ce{[Ni(CO)4]}$ }, { $\ce{[NiCl4]^2-}$ , $\ce{[Ni(CN)4]^2-}$ } and { $\ce{[Ni(CO)4]}$ , $\ce{[Ni(CN)4]^2-}$ } that contain only diamagnetic species is two.
In the light of the above statements, choose the correct answer from the options given below:
1. (1)Statement I is false but Statement II is true
2. (2)Both Statement I and Statement II are true
3. (3)Both Statement I and Statement II are false
4. (4)Statement I is true but Statement II is false
We corrected a printing error in the original paper
Source printed “[Cu(NH $_3$ ) $^{2+}$ ” (subscript 4 and closing bracket missing), “[Ni(en) $_3$ )] $^{2+}$ ” and the second pair “[NiCl $_4$ ] $^{2-}$ , [Ni(CN) $_4$ ] $^{2-}$ ” without its closing brace.
ChemistryJEE Main 21 Jan 2026, Shift 2·Q13·MCQ·Moderate
Open
CFSE and spin only magnetic moment
Given below are two statements:
Statement I: Crystal Field Stabilization Energy (CFSE) of $\ce{[Cr(H2O)6]^{2+}}$ is greater than that of $\ce{[Mn(H2O)6]^{2+}}$ .
Statement II: Potassium ferricyanide has a greater spin-only magnetic moment than sodium Ferrocyanide.
In the light of the above statements, choose the correct answer from the options given below:
1. (1)Both Statement I and Statement II are true
2. (2)Both Statement I and Statement II are false
3. (3)Statement I is true but Statement II is false
4. (4)Statement I is false but Statement II is true
ChemistryJEE Main 22 Jan 2026, Shift 1·Q1·MCQ·Easy–moderate
Open
Low spin d electron configurations
Consider the transition metal ions $\ce{Mn^{3+}}$ , $\ce{Cr^{3+}}$ , $\ce{Fe^{3+}}$ and $\ce{Co^{3+}}$ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is
1. (1) $\ce{Cr^{3+}}$ $>$ $\ce{Fe^{3+}}$ $>$ $\ce{Co^{3+}}$ $>$ $\ce{Mn^{3+}}$
2. (2) $\ce{Mn^{3+}}$ $>$ $\ce{Fe^{3+}}$ $>$ $\ce{Co^{3+}}$ $>$ $\ce{Cr^{3+}}$
3. (3) $\ce{Fe^{3+}}$ $>$ $\ce{Co^{3+}}$ $>$ $\ce{Mn^{3+}}$ $>$ $\ce{Cr^{3+}}$
4. (4) $\ce{Cr^{3+}}$ $>$ $\ce{Mn^{3+}}$ $>$ $\ce{Fe^{3+}}$ $>$ $\ce{Co^{3+}}$
ChemistryJEE Main 22 Jan 2026, Shift 1·Q8·MCQ·Moderate
Open
Cyanide complex stability
A first row transition metal (M) does not liberate $\ce{H2}$ gas from dilute HCl. 1 mol of aqueous solution of $\ce{MSO4}$ is treated with excess of aqueous KCN and then $\ce{H2S(g)}$ is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is mol.
1. (1)2
2. (2)1
3. (3)3
4. (4)0
We corrected a printing error in the original paper
Source printed “A first row transition metla (M)”.
ChemistryJEE Main 22 Jan 2026, Shift 2·Q16·MCQ·Moderate
Open
Tetrahedral nickel complex properties
$\ce{[Ni(PPh3)2Cl2]}$ 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 2.84 BM.
- (D)The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is $-0.8\Delta_0$ .
- (E)The geometrical arrangement of ligands in this complex is similar to that in $\ce{Ni(CO)4}$ .
Choose the correct answer from the options given below :
1. (1)A and B only
2. (2)A, B and D only
3. (3)C and D only
4. (4)C, D and E only
ChemistryJEE Main 23 Jan 2026, Shift 1·Q9·MCQ·Easy–moderate
Open
Spectrochemical series tetrahedral splitting
Given below are two statements :
Statement I : $\ce{[CoBr4]^{2-}}$ ion will absorb light of lower energy than $\ce{[CoCl4]^{2-}}$ ion.
Statement II : In $\ce{[CoI4]^{2-}}$ ion, the energy separation between the two set of d-orbitals is more than $\ce{[CoCl4]^{2-}}$ ion.
In the light of the above statements, choose the correct answer from the options given below :
1. (1)Both Statement I and Statement II are false
2. (2)Statement I is true but Statement II is false
3. (3)Statement I is false but Statement II is true
4. (4)Both Statement I and Statement II are true
ChemistryJEE Main 23 Jan 2026, Shift 1·Q13·MCQ·Moderate
Open
Nickel dimethylglyoxime complex
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 pH = 9
- (C)The Ni ion has two unpaired d-electrons
- (D)The N – Ni – N bond angle is almost close to 90 $^\circ$
- (E)The complex contains four five-membered metallacycles (metal containing rings)
Choose the correct answer from the options given below :
1. (1)C and E only
2. (2)A, D and B only
3. (3)B, C and E only
4. (4)C and D only
ChemistryJEE Main 23 Jan 2026, Shift 1·Q25·Numerical·Moderate
Open
Crystal field stabilisation energy
The crystal field stabilisation energy of $\ce{[Co(oxalate)3]^{3-}}$ complex is ‘n' times that of the $\ce{[Cr(oxalate)3]^{3-}}$ complex. Here ‘n' is . [Assume $\Delta_\mathrm{o} \gg P$ ]
We corrected a printing error in the original paper
Source printed “The crystal field splitting energy”; corrected to the intended “crystal field stabilisation energy” (the splitting $\Delta_\mathrm{o}$ is about the same for both oxalato complexes; the key 2 is the CFSE ratio $-2.4\Delta_\mathrm{o}/-1.2\Delta_\mathrm{o}$ ).
ChemistryJEE Main 23 Jan 2026, Shift 2·Q5·MCQ·Easy–moderate
Open
Valence bond theory hybridisation
Identify the CORRECT set of details from the following :
- (A) $\ce{[Co(NH3)6]^{3+}}$ : Inner orbital complex ; $\mathrm{d^2sp^3}$ hybridized
- (B) $\ce{[MnCl6]^{3-}}$ Outer orbital complex; $\mathrm{sp^3d^2}$ hybridized
- (C) $\ce{[CoF6]^{3-}}$ : Outer orbital complex ; $\mathrm{d^2sp^3}$ hybridized
- (D) $\ce{[FeF6]^{3-}}$ : Outer orbital complex: $\mathrm{sp^3d^2}$ hybridized
- (E) $\ce{[Ni(CN)4]^{2-}}$ : Inner orbital complex ; $\mathrm{sp^3}$ hybridized
Choose the correct answer from the options given below:
1. (1)C & D only
2. (2)A, B & D only
3. (3)A, C & E only
4. (4)A, B, C, D & E
ChemistryJEE Main 23 Jan 2026, Shift 2·Q24·Numerical·Easy–moderate
Open
Unpaired electrons in complexes
Total number of unpaired electrons present in the central metal atoms/ions of $\ce{[Ni(CO)4]}$ , $\ce{[NiCl4]^{2-}}$ , $\ce{[PtCl2(NH3)2]}$ , $\ce{[Ni(CN)4]^{2-}}$ and $\ce{[Pt(CN)4]^{2-}}$ is .
We corrected a printing error in the original paper
Source printed “[Ni(CN $_4$ )] $^{2-}$ ” and “[Pt (CN $_4$ )] $^{2-}$ ”.
ChemistryJEE Main 24 Jan 2026, Shift 1·Q1·MCQ·Moderate
Open
Valence bond theory magnetic moment
Given below are two statements :
Statement-I Hybridisation, shape and spin only magnetic moment of $\ce{K3[Co(CO3)3]}$ are sp $^3$ d $^2$ , octahedral and 4.9 BM respectively.
Statement-II Geometry, hybridisation and spin only magnetic moment values (BM) of the ions $\ce{[Ni(CN)4]^{2-}}$ , $\ce{[MnBr4]^{2-}}$ and $\ce{[CoF6]^{3-}}$ respectively are square planar, tetrahedral, octahedral : dsp $^2$ , sp $^3$ , sp $^3$ d $^2$ and 0, 5.9, 4.9.
In the light of the above statements, choose the correct answer from the options given below
1. (1)Both statement-I and statement-II are false
2. (2)Statement I is false but statement-II is true
3. (3)Both statement-I and statement-II are true
4. (4)Statement-I is true but statement-II is false
We corrected a printing error in the original paper
Answer corrected; the source key is (3) — $\ce{[Co(CO3)3]^{3-}}$ is a low-spin Co(III) (d $^6$ ) complex like $\ce{[Co(C2O4)3]^{3-}}$ : d $^2$ sp $^3$ , diamagnetic (0 BM), so Statement-I is false and Statement-II is true; also source printed “spin only magnetic moment of $\ce{K3[Co(CO3)3]}$ is”.
ChemistryJEE Main 24 Jan 2026, Shift 1·Q8·MCQ·Easy–moderate
Open
Ionisation isomers precipitation
Consider a mixture ‘X' which is made by dissolving 0.4 mol of $\ce{[Co(NH3)5SO4]Br}$ and 0.4 mol of $\ce{[Co(NH3)5Br]SO4}$ in water to make 4 L of solution. When 2 L of mixture ‘X' is allowed to react with excess of $\ce{AgNO3}$ , it forms precipitate ‘Y'. The rest 2 L of mixture ‘X' reacts with excess $\ce{BaCl2}$ to form precipitate ‘Z'. Which of the following statements is CORRECT.
1. (1)0.2 mol of ‘Z' is formed
2. (2)‘Y' is $\ce{BaSO4}$ and ‘Z' is AgBr
3. (3)0.4 mol of ‘Z' is formed
4. (4)0.1 mol of ‘Y' is formed
ChemistryJEE Main 24 Jan 2026, Shift 1·Q9·MCQ·Moderate
Open
Magnetic properties of complexes
Given below are two statements
Statement-I : The number of paramagnetic species among $\ce{[CoF6]^{3-}}$ , $\ce{[TiF6]^{3-}}$ , $\ce{V2O5}$ and $\ce{[Fe(CN)6]^{3-}}$ is 3.
Statement-II : $\ce{K4[Fe(CN)6]}$ $<$ $\ce{K3[Fe(CN)6]}$ $<$ $\ce{[Fe(H2O)6]SO4.H2O}$ $<$ $\ce{[Fe(H2O)6]Cl3}$ is the correct order in terms of number of unpaired electron(s) in the complexes.
In the light of the above statements, choose the correct answer from the options given below.
1. (1)Both statement-I and statement-II are true
2. (2)Both statement-I and statement-II are false
3. (3)Statement-I is true but statement-II is false
4. (4)Statement-I is false but statement-II is true
We corrected a printing error in the original paper
Source printed “Statements-I :”.
ChemistryJEE Main 24 Jan 2026, Shift 2·Q7·MCQ·Easy–moderate
Open
Spectrochemical series absorbed wavelength
The wavelengths of light absorbed for the following complexes are in the order. $\underset{\text{(I)}}{\ce{[Co(NH3)6]^3+}}\ ;\ \underset{\text{(II)}}{\ce{[Co(H2O)6]^3+}}\ ;\ \underset{\text{(III)}}{\ce{[Co(CN)6]^3-}}\ ;\ \underset{\text{(IV)}}{\ce{[Co(NH3)5(H2O)]^3+}}\ ;\ \underset{\text{(V)}}{\ce{[CoF6]^3-}}$
1. (1)III $<$ I $<$ II $<$ IV $<$ V
2. (2)III $<$ I $<$ IV $<$ V $<$ II
3. (3)III $<$ IV $<$ I $<$ II $<$ V
4. (4)III $<$ I $<$ IV $<$ II $<$ V
We corrected a printing error in the original paper
Source printed “The wavelength of light absorbed for the following complexes are”.
ChemistryJEE Main 24 Jan 2026, Shift 2·Q23·Numerical·Moderate
Open
Ionisation isomers and conductivity
A chromium complex with a formula $\ce{CrCl3.6H2O}$ 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. The solution obtained after the process was reacted with excess of $\ce{AgNO3}$ . The amount of AgCl formed in the above process is g. (Nearest integer)
[Given : Molar mass in g mol $^{-1}$ Cr : 52; Cl : 35.5, Ag : 108, O : 16, H : 1]
ChemistryJEE Main 28 Jan 2026, Shift 1·Q20·MCQ·Easy–moderate
Open
Magnetic properties of complexes
The correct statement among the following is :
1. (1) $\ce{[Ni(CN)4]^{2-}}$ and $\ce{[NiCl4]^{2-}}$ are diamagnetic and $\ce{Ni(CO)4}$ is paramagnetic.
2. (2) $\ce{Ni(CO)4}$ and $\ce{[NiCl4]^{2-}}$ are diamagnetic and $\ce{[Ni(CN)4]^{2-}}$ is paramagnetic.
3. (3) $\ce{Ni(CO)4}$ and $\ce{[Ni(CN)4]^{2-}}$ are diamagnetic and $\ce{[NiCl4]^{2-}}$ is paramagnetic.
4. (4) $\ce{Ni(CO)4}$ is diamagnetic and $\ce{[NiCl4]^{2-}}$ and $\ce{[Ni(CN)4]^{2-}}$ are paramagnetic.
ChemistryJEE Main 28 Jan 2026, Shift 1·Q23·Numerical·Moderate
Open
Isomerism in coordination compounds
X is the number of geometrical isomers exhibited by $\ce{[Pt(NH3)(H2O)BrCl]}$ .
Y is the number of optically inactive isomer(s) exhibited by $\ce{[CrCl2(ox)2]^{3-}}$
Z is the number of geometrical isomers exhibited by $\ce{[Co(NH3)3(NO2)3]}$
The value of X + Y + Z is .
ChemistryJEE Main 28 Jan 2026, Shift 2·Q19·MCQ·Easy–moderate
Open
Spin-only magnetic moment of complexes
The correct increasing order of spin-only magnetic moment values of the complex ions $\ce{[MnBr4]^2-}$ (A), $\ce{[Cu(H2O)6]^2+}$ (B), $\ce{[Ni(CN)4]^2-}$ (C) and $\ce{[Ni(H2O)6]^2+}$ (D) is:
1. (1)A $=$ B $<$ C $<$ D
2. (2)A $=$ B $<$ D $<$ C
3. (3)C $=$ D $<$ B $<$ A
4. (4)C $<$ B $<$ D $<$ A
We corrected a printing error in the original paper
Source printed “[Ni(CN $_4$ )] $^{2-}$ ”.
ChemistryJEE Main 28 Jan 2026, Shift 2·Q25·Numerical·Moderate
Open
Werner complex and t2g electron count
The number of isoelectronic species among $\ce{Sc^3+}$ , $\ce{Cr^2+}$ , $\ce{Mn^3+}$ , $\ce{Co^3+}$ and $\ce{Fe^3+}$ is ‘n'. If ‘n' moles of AgCl is formed during the reaction of complex with formula $\ce{CoCl3(en)2NH3}$ with excess of $\ce{AgNO3}$ solution, then the number of electrons present in the $t_{2g}$ orbital of the complex is .

ChemistryJEE Main 2 Apr 2026, Shift 1·Q12·MCQ·Easy–moderate

Spectrochemical series crystal field splitting

Match List – I with List – II.

List – I		List – II
Chromium (III) Complexes		$\boldsymbol{\Delta_0}$ (cm $^{\mathbf{-1}}$ )
(en = ethylene diamine)
A.	$\ce{[Cr(CN)6]^3-}$	I.	15,060
B.	$\ce{[CrF6]^3-}$	II.	17,400
C.	$\ce{[Cr(H2O)6]^3+}$	III.	22,300
D.	$\ce{[Cr(en)3]^3+}$	IV.	26,600

Choose the correct answer from the options given below :

(1)A-I, B-II, C-III, D-IV
(2)A-II, B-III, C-IV, D-I
(3)A-III, B-IV, C-I, D-II
(4)A-IV, B-I, C-II, D-III

We corrected a printing error in the original paper

Source printed “[Cr(H $_2$ O) $_6$ )] $^{3+}$ ” (stray closing parenthesis).

ChemistryJEE Main 2 Apr 2026, Shift 1·Q21·Numerical·Moderate
Open
Ionisable chloride of hydrate isomers
5.33 g of $\ce{CrCl3*6H2O}$ , 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 $\ce{AgNO3}$ result in 8.61 g of AgCl. The ratio of moles of complex reacted and moles of AgCl formed is $\times10^{-2}$ . (Nearest integer)
[Molar mass in g mol $^{-1}$ Cr : 52, Ag : 108, Cl : 35.5, H : 1, O : 16]
We corrected a printing error in the original paper
Source printed “The chloride ions … on treatment with AgNO $_3$ results in”.
ChemistryJEE Main 2 Apr 2026, Shift 2·Q11·MCQ·Easy–moderate
Open
Coordination isomerism
Which of the following complexes will show coordination isomerism ?
(Take coordination isomerism as the interchange of ligands between the cationic and anionic entities of different metals.)
- (A) $\ce{[Ag(NH3)2][Ag(CN)2]}$
- (B) $\ce{[Co(NH3)6][Cr(CN)6]}$
- (C) $\ce{[Co(NH3)6][Co(CN)6]}$
- (D) $\ce{[Fe(NH3)6][Co(CN)6]}$
- (E) $\ce{[Co(NH3)6][Fe(CN)6]}$
Choose the correct answer from the options given below :
1. (1)B, C and D Only
2. (2)B, D and E Only
3. (3)A, C and D Only
4. (4)C, D and E Only
We corrected a printing error in the original paper
Assumption “(Take coordination isomerism as the interchange of ligands between the cationic and anionic entities of different metals.)” added and answer corrected; the source states no definition and its key accepts (1), (2) and (4), since in the broad sense C (two Co centres) also qualifies and no option lists B, C, D and E; with the textbook definition only B, D and E qualify.

ChemistryJEE Main 4 Apr 2026, Shift 1·Q12·MCQ·Easy–moderate

Spin only magnetic moment

Match the List-I with List-II

List-I		List-II
Complex ion		Calculated spin only
		magnetic moment (BM)
A.	$\ce{[Cr(H2O)6]^2+}$	I.	3.87
B.	$\ce{[Co(H2O)6]^2+}$	II.	5.92
C.	$\ce{[Cu(H2O)6]^2+}$	III.	4.90
D.	$\ce{[Mn(H2O)6]^2+}$	IV.	1.73

Choose the correct answer from the options given below:

(1)A-I, B-III, C-IV, D-II
(2)A-II, B-I, C-III, D-IV
(3)A-IV, B-II, C-I, D-III
(4)A-III, B-I, C-IV, D-II

ChemistryJEE Main 4 Apr 2026, Shift 2·Q10·MCQ·Moderate
Open
Crystal field splitting and colour
Consider the metal complexes $\ce{[Ni(en)3]^2+}$ (A), $\ce{[NiCl4]^2-}$ (B) and $\ce{[Ni(NH3)6]^2+}$ (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.
1. (1)2, 2, 2 and (A) $>$ (C) $>$ (B)
2. (2)0, 2, 0 and (A) $>$ (C) $>$ (B)
3. (3)2, 2, 0 and (B) $>$ (C) $>$ (A)
4. (4)2, 2, 2 and (C) $>$ (A) $>$ (B)
ChemistryJEE Main 5 Apr 2026, Shift 1·Q11·MCQ·Easy–moderate
Open
Bonding in metal carbonyls
The correct statements about metal carbonyls are
- (A)The metal-carbon bonds in metal 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 $\sigma$ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal.
- (D)The metal-carbon $\pi$ bond is formed by the donation of electrons from filled d-orbital of metal into vacant $\pi^*$ orbital of CO.
Choose the correct answer from the options given below :
1. (1)A and B only
2. (2)A, C and D only
3. (3)B and C only
4. (4)A and D only
We corrected a printing error in the original paper
Source printed “bonds in metals carbonyls”.
ChemistryJEE Main 5 Apr 2026, Shift 1·Q12·MCQ·Easy
Open
Crystal field splitting
Given below are two statements :
Statement I : Each electron in e $_\mathrm{g}$ orbitals destabilizes the orbitals by $+0.6\,\Delta_0$ and each electron in the t $_\mathrm{2g}$ orbitals stabilizes the orbitals by $-0.4\,\Delta_0$ in an octahedral field on the basis of crystal field theory.
Statement II : All the d-orbitals of the transition metals have the same energy in their free atomic state but when a complex is formed the ligands destroy the degeneracy of these orbitals on the basis of crystal field theory.
In the light of the above statements, choose the correct answer from the options given below.
1. (1)Both Statement I and Statement II are correct
2. (2)Both Statement I and Statement II are incorrect
3. (3)Statement I is correct but Statement II is incorrect
4. (4)Statement I is incorrect but Statement II is correct
ChemistryJEE Main 5 Apr 2026, Shift 2·Q11·MCQ·Moderate
Open
Stability hybridisation linkage isomerism
Identify the correct statements from the following:
- (A) $\ce{[Fe(C2O4)3]^{3-}}$ is the most stable complex among $\ce{[Fe(OH)6]^{3-}}$ , $\ce{[Fe(C2O4)3]^{3-}}$ and $\ce{[Fe(SCN)6]^{3-}}$
- (B)The stability of $\ce{[Cu(NH3)4]^{2+}}$ is greater than that of $\ce{[Cu(en)2]^{2+}}$
- (C)The hybridization of Fe in $\ce{K4[Fe(CN)6]}$ is d $^2$ sp $^3$
- (D) $\ce{[Fe(NO2)3Cl3]^{3-}}$ exhibits linkage isomerism
- (E) $\ce{NO2-}$ and $\ce{SCN-}$ ligands are NOT ambidentate ligands
Choose the correct answer from the options given below :
1. (1)A, B, C, D and E
2. (2)B, C and D only
3. (3)A, C and D only
4. (4)A, C and E only
ChemistryJEE Main 5 Apr 2026, Shift 2·Q21·Numerical·Easy–moderate
Open
Crystal field unpaired electrons
The total number of unpaired electrons present in the d $^3$ , d $^4$ (low spin) d $^5$ (high spin), d $^6$ (high spin) and d $^7$ (low spin) octahedral complex systems is .

ChemistryJEE Main 6 Apr 2026, Shift 1·Q11·MCQ·Moderate

Crystal field stabilisation energy tetrahedral

Match the List-I with List-II

List-I		List-II
Electronic configuration of		Crystal Field
tetrahedral metal ion		Stabilization Energy ( $\boldsymbol{\Delta_\mathrm{t}}$ )
A.	d $^2$	I.	$-0.6$
B.	d $^4$	II.	$-0.8$
C.	d $^6$	III.	$-1.2$
D.	d $^8$	IV.	$-0.4$

Choose the correct answer from the options given below :

(1)A-III, B-IV, C-II, D-I
(2)A-III, B-I, C-IV, D-II
(3)A-III, B-IV, C-I, D-II
(4)A-II, B-I, C-IV, D-III

ChemistryJEE Main 6 Apr 2026, Shift 1·Q12·MCQ·Easy–moderate
Open
Tetrahedral crystal field splitting
Which of the following are true about the energy of the given d-orbitals of a tetrahedral complex ?
- (A) $\mathrm{d}_{xy} = \mathrm{d}_{xz} > \mathrm{d}_{x^2-y^2}$
- (B) $\mathrm{d}_{xy} = \mathrm{d}_{yz} > \mathrm{d}_{z^2}$
- (C) $\mathrm{d}_{x^2-y^2} > \mathrm{d}_{z^2} > \mathrm{d}_{xz}$
- (D) $\mathrm{d}_{x^2-y^2} = \mathrm{d}_{z^2} < \mathrm{d}_{xz}$
Choose the correct answer from the options given below :
1. (1)A, B and D only
2. (2)A and B only
3. (3)B and D only
4. (4)B, C and D only
ChemistryJEE Main 6 Apr 2026, Shift 2·Q11·MCQ·Easy–moderate
Open
Valence bond theory hybridisation magnetism
Which of the following sequence of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ?
- (A) $\ce{[NiCl4]^{2-}}$ – sp $^3$ , tetrahedral, paramagnetic
- (B) $\ce{[Ni(NH3)6]^{2+}}$ – sp $^3$ d $^2$ , octahedral, paramagnetic
- (C) $\ce{[Ni(CO)4]}$ – sp $^3$ , tetrahedral, paramagnetic
- (D) $\ce{[Ni(CN)4]^{2-}}$ – dsp $^2$ , square planar diamagnetic
Choose the correct answer from the options given below :
1. (1)A, B, C and D
2. (2)B, C and D only
3. (3)A, C and D only
4. (4)A, B and D only
ChemistryJEE Main 6 Apr 2026, Shift 2·Q21·Numerical·Easy–moderate
Open
Ionisation isomerism and agcl precipitation
An excess of $\ce{AgNO3}$ is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles of AgCl precipitated will be $\times\,10^{-3}$ . (Nearest integer)
ChemistryJEE Main 8 Apr 2026, Shift 2·Q21·Numerical·Moderate
Open
Magnetic properties of complexes
Number of paramagnetic complexes among the following is .
$\ce{[MnBr4]^2-}$ , $\ce{[NiCl4]^2-}$ , $\ce{[Ni(CN)4]^2-}$ , $\ce{[Ni(CO)4]}$ , $\ce{[CoF6]^3-}$ , $\ce{[Fe(CN)6]^4-}$ , $\ce{[Mn(CN)6]^3-}$ , $\ce{[Ti(CN)6]^3-}$ , $\ce{[Cu(H2O)6]^2+}$ , $\ce{[Co(C2O4)3]^3-}$