Question 1: Palette 1/107

NEET 2026 MCQ

$ \text { Match List I with List II : } $

List-I (Complex)		List-II (Type of isomerism)
A.	$ \left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right] $	I.	Optical
B.	$ \left[\mathrm{Co}(\mathrm{en})_3\right]^{3+} $	II.	Solvate
C.	$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{NO}_2\right] \mathrm{Cl}_2 $	III.	Geometrical
D.	$ \left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3 $	IV.	Linkage

Choose the correct answer from the options given below :

A

A-III, B-I, C-II, D-IV

B

A-I, B-III, C-II, D-IV

C

A-II, B-IV, C-III, D-I

D

A-III, B-I, C-IV, D-II

Question 2: Palette 2/107

NEET 2026 MCQ

Which one of the following is an ambidentate ligand?

A

Ethane-1,2-diamine

B

Ethylenediaminetetraacetate ion

C

Thiocyanate

D

Oxalate

Question 3: Palette 3/107

NEET 2026 MCQ

$ \text { Match List I with List II : } $

List I (Complex/ion)		List II (Shape/geometry)
A.	$ \left[\mathrm{Pt}\left(\mathrm{Cl}_2\right)\left(\mathrm{NH}_3\right)_2\right] $	I.	Octahedral
B.	$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3 $	II.	Trigonal bipyramidal
C.	$ \left[\mathrm{NiCl}_4\right]^{2-} $	III.	Square planar
D.	$ \left[\mathrm{Fe}(\mathrm{CO})_5\right] $	IV.	Tetrahedral

Choose the correct answer from the options given below :

A

A-III, B-IV, C-I, D-II

B

A-III, B-I, C-IV, D-II

C

A-IV, B-I, C-III, D-II

D

A-I, B-III, C-IV, D-II

Question 4: Palette 4/107

NEET 2026 MCQ

The formula of tetraammineaquachloridocobalt(III) chloride is

A

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{Cl}\right] \mathrm{Cl}_2$

B

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \times \mathrm{H}_2 \mathrm{O}$

C

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\right] \mathrm{Cl}_3 \times \mathrm{H}_2 \mathrm{O}$

D

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{Cl}\right] \mathrm{Cl}$

Question 5: Palette 5/107

NEET 2026 MCQ

Given below are two statements:

Statement-I : $\left[\mathrm{Fe}(\mathrm{ox})_3\right]^{3-}$ is chiral.

Statement-II : trans $-\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_2(\mathrm{ox})_2\right]^{-}$is chiral.

(Given : $\mathrm{oxH}_2=\mathrm{HOOC}-\mathrm{COOH}$ )

In light of the above statements, choose the most appropriate answer from the options given below:

A

Statement-I is incorrect but Statement-II is correct

B

Both Statement-I and Statement-II are correct

C

Both Statement-I and Statement-II are incorrect

D

Statement-I is correct but Statement-II is incorrect

Question 6: Palette 6/107

NEET 2026 MCQ

The complex which has facial and meridional isomers is

(Given : py = pyridine and en = $\mathrm{H}_2 \mathrm{~N}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{NH}_2$ )

A

$\left[\mathrm{Ni}(\mathrm{en})_2\left(\mathrm{H}_2 \mathrm{O}\right)_2\right]^{2+}$

B

$\left[\mathrm{Cr}(\mathrm{py})_3(\mathrm{Cl})_3\right]$

C

$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

D

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right)_2\right]^{3+}$

Question 7: Palette 7/107

NEET 2026 MCQ

A $1: 3$ electrolyte in an aqueous solution is

A

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_2\right)_3\right]$

B

$\left[\mathrm{CoCl}_2\left(\mathrm{NH}_3\right)_4\right] \mathrm{Cl}$

C

$\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right] \mathrm{Cl}_2$

D

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$

Question 8: Palette 8/107

NEET 2026 MCQ

According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

A

$\mathrm{Cl}^{-}>\mathrm{NH}_3>\mathrm{H}_2 \mathrm{O}>\mathrm{CO}$

B

$\mathrm{CO}>\mathrm{NH}_3>\mathrm{H}_2 \mathrm{O}>\mathrm{Cl}^{-}$

C

$\mathrm{CO}>\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{Cl}^{-}$

D

$\mathrm{Cl}^{-}>\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{CO}$

Question 9: Palette 9/107

NEET 2026 MCQ

Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of $\mathrm{Ti}=22, \mathrm{Mn}=25, \mathrm{Fe}=26$ and $\mathrm{Co}=27$ )

A

$\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

B

$\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$

C

$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$

D

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$

Question 10: Palette 10/107

NEET 2025 MSQ

Out of the following complex compounds, which of the compound will be having the minimum conductance solution?

A

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$

B

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}$

C

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$

D

$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]$

Question 11: Palette 11/107

NEET 2025 MCQ

Which of the following are paramagnetic?

A. $\left[\mathrm{NiCl}_4\right]^{2-}$

B. $\mathrm{Ni}(\mathrm{CO})_4$

C. $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$

D. $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$

E. $\mathrm{Ni}\left(\mathrm{PPh}_3\right)_4$

Choose the correct answer from the options given below :

A

A and D only

B

A, D and E only

C

A and C only

D

B and E only

Question 12: Palette 12/107

NEET 2025 MCQ

The correct order of the wavelength of light absorbed by the following complexes is,

A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$

B. $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$

C. $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$

D. $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

Choose the correct answer from the options given below:

A

C $<$ D $<$ A $<$ B

B

  C $<$ A $<$ D $<$ B

C

B $<$ D $<$ A $<$ C

D

B $<$ A $<$ D $<$ C

Question 13: Palette 13/107

NEET 2024 MCQ

Ethylene diaminetetraacetate ion is a/an:

A

hexadentate ligand

B

ambidentate ligand

C

monodentate ligand

D

bidentate ligand

Question 14: Palette 14/107

NEET 2024 MCQ

Which of the following is not an ambidentate ligand?

A

$ \mathrm{C}_2 \mathrm{O}_4^{2-} $

B

SCN$^-$

C

NO$_2^-$

D

CN$^-$

Question 15: Palette 15/107

NEET 2024 MCQ

$\left[\mathrm{Mn}_2(\mathrm{CO})_{10}\right]$ and $\left[\mathrm{Co}_2(\mathrm{CO})_8\right]$ structures have

A. Metal-Metal linkage

B. Terminal CO groups

C. Bridging CO groups

D. Metal in zero oxidation state

Choose the correct answer from the options given below

A

Only A, B, C

B

Only B, C, D

C

Only A, C, D

D

Only A, B, D

Question 16: Palette 16/107

NEET 2024 MCQ

Match List I with List II.

	List I (Complex)		List II (Type of isomerism)
A.	$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right)\right] \mathrm{Cl}_2 $	I.	Solvate isomerism
B.	$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{SO}_4\right)\right] \mathrm{Br} $	II.	Linkage isomerism
C.	$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]\left[\mathrm{Cr}(\mathrm{CN})_6\right] $	III.	Ionization isomerism
D.	$ \left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3 $	IV.	Coordination isomerism

Choose the correct answer from the options given below:

A

A-II, B-III, C-IV, D-I

B

A-I, B-III, C-IV, D-II

C

A-I, B-IV, C-III, D-II

D

A-II, B-IV, C-III, D-I

Question 17: Palette 17/107

NEET 2024 MCQ

Given below are two statements :

Statement I: Both $[\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}$ and $[\mathrm{CoF}_6]^{3-}$ complexes are octahedral but differ in their magnetic behaviour.

Statement II: $[\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}$ is diamagnetic whereas $[\mathrm{CoF}_6]^{3-}$ is paramagnetic.

In the light of the above statements, choose the correct answer from the options given below:

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 18: Palette 18/107

NEET 2024 MCQ

Given below are two statements :

Statement I : $[\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}$ is a homoleptic complex whereas $[\mathrm{Co}(\mathrm{NH}_3)_4 \mathrm{Cl}_2]^{+}$ is a heteroleptic complex.

Statement II : Complex $[\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}$ has only one kind of ligands but $[\mathrm{Co}(\mathrm{NH}_3)_4 \mathrm{Cl}_2]^{+}$ has more than one kind of ligands.

In the light of the above statements, choose the correct answer from the options given below.

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 19: Palette 19/107

NEET 2023 MCQ

Select the element (M) whose trihalides cannot be hydrolysed to produce an ion of the form [M(H$_2$O$_6$]$^{3+}$

A

Ga

B

In

C

Al

D

B

Question 20: Palette 20/107

NEET 2023 MCQ

Which of the following forms a set of complex and a double salt, respectively?

A

$\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}$ and $\mathrm{CuCl}_2, 4 \mathrm{NH}_3$

B

$\mathrm{PtCl}_2 \cdot 2 \mathrm{NH}_3$ and $\mathrm{PtCl}_4 \cdot 2 \mathrm{HCl}$

C

$\mathrm{K}_2 \mathrm{PtCl}_2 \cdot 2 \mathrm{NH}_3$ and $\mathrm{KAl}\left(\mathrm{SO}_4\right)_2 \cdot 12 \mathrm{H}_2 \mathrm{O}$

D

$\mathrm{NiCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O}$ and $\mathrm{NiCl}_2\left(\mathrm{H}_2 \mathrm{O}\right)_4$

Question 21: Palette 21/107

NEET 2023 MCQ

Type of isomerism exhibited by compounds $ \left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6 \mathrm{Cl}_3,\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{Cl}_2 \mathrm{Cl}_2 \cdot \mathrm{H}_2 \mathrm{O}\right.\right.,\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl} .2 \mathrm{H}_2 \mathrm{O}$ and the value of coordination number $(\mathrm{CN})$ of central metal ion in all these compounds, respectively is :

A

Geometrical isomerism, CN = 2

B

Optical isomerism, CN = 4

C

Ionisation isomerism, CN = 4

D

Solvate isomerism, CN = 6

Question 22: Palette 22/107

NEET 2023 MCQ

Homoleptic complex from the following complexes is :

A

Diamminechloridonitrito-N-platinum (II)

B

Pentaamminecarbonatocobalt (III) chloride

C

Triamminetriaquachromium (III) chloride

D

Potassium trioxalatoaluminate (III)

Question 23: Palette 23/107

NEET 2023 MCQ

Which complex compound is most stable?

A

$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{3}\right)_{3}\right]$

B

$\left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right] \mathrm{NO}_{3}$

C

$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]_{2}\left(\mathrm{SO}_{4}\right)_{3}$

D

$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Br}\right]\left(\mathrm{NO}_{3}\right)_{2}$

Question 24: Palette 24/107

NEET 2022 MCQ

Match List-I with List-II :

	List-I (Complexes)		List-II (Types)
(a)	$[Co{(N{H_3})_5}N{O_2}]C{l_2}$ and $[Co{(N{H_3})_5}ONO]C{l_2}$	(i)	ionisation isomerism
(b)	$[Cr{(N{H_3})_6}][Co{(CN)_6}]$ and $[Cr{(CN)_6}][Co{(N{H_3})_6}]$	(ii)	coordination isomerism
(c)	$[Co{(N{H_3})_5}(S{O_4})]Br$ and $[Co{(N{H_3})_5}Br]S{O_4}$	(iii)	linkage isomerism
(d)	$[Cr{({H_2}O)_6}]C{l_3}$ and $[Cr{({H_2}O)_5}Cl]C{l_2}\,.\,{H_2}O$	(iv)	solvate isomerism

Choose the correct answer from the options given below :

A

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

B

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

C

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

D

(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

Question 25: Palette 25/107

NEET 2022 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : The metal carbon bond in metal carbonyls possesses both $\sigma$ and $\pi$ character.

Reason (R) : The ligand to metal bond is a $\pi$ bond and metal to ligand bond is a $\sigma$ bond.

In the light of the above statements, choose the most appropriate answer from the options given below.

A

(A) is not correct but (R) is correct

B

Both (A) and (R) are correct and (R) is the correct explanation of (A)

C

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

D

(A) is correct but (R) is not correct

Question 26: Palette 26/107

NEET 2022 MCQ

The IUPAC name of the complex -

[Ag(H₂O)₂][Ag(CN)₂] is:

A

dicyanidosilver(II) diaquaargentate (II)

B

diaquasilver(II) dicyanidoargentate(II)

C

dicyanidosilver(I) diaquaargentate(I)

D

diaquasilver(I) dicyanidoargentate(I)

Question 27: Palette 27/107

NEET 2022 MCQ

The order of energy absorbed which is responsible for the color of complexes

(A) [Ni(H₂O)₂(en)₂]²⁺

(B) [Ni(H₂O)₄(en)]²⁺ and

(C) [Ni(en)₃]²⁺

is

A

(A) > (B) > (C)

B

(C) > (B) > (A)

C

(C) > (A) > (B)

D

(B) > (A) > (C)

Question 28: Palette 28/107

NEET 2021 MCQ

Ethylene diaminetetraacetate (EDTA) ion is :

A

Tridentate ligand with three "N" donor atoms

B

hexadentate ligand with four "O" and two "N" donor atoms

C

Unidentate ligand

D

Bidentate ligand with two "N" donor atoms

Question 29: Palette 29/107

NEET 2021 MCQ

Match List-I with List-II :

	List-I		List-II
(a)	${[Fe{(CN)_6}]^{3 - }}$	(i)	5.92 BM
(b)	${[Fe{({H_2}O)_6}]^{3 + }}$	(ii)	0 BM
(c)	${[Fe{(CN)_6}]^{4 - }}$	(iii)	4.90 BM
(d)	${[Fe{({H_2}O)_6}]^{2 + }}$	(iv)	1.73 BM

Choose the correct answer from the options given below.

A

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

B

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

C

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

D

(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

Question 30: Palette 30/107

NEET 2020 MCQ

The calculated spin only magnetic moment of Cr²⁺ ion is?

A

4.90 BM

B

5.92 BM

C

2.84 BM

D

3.87 BM

Question 31: Palette 31/107

NEET 2020 MCQ

Urea reacts with water to form A which will decompose to form B. B when passed through Cu²⁺ (aq), deep blue colour solution C is formed. What is the formula of C from the following?

A

${[Cu{(N{H_3})_4}]^{2 + }}$

B

$Cu{(OH)_2}$

C

$CuC{O_3}.Cu{(OH)_2}$

D

$CuS{O_4}$

Question 32: Palette 32/107

NEET 2020 MCQ

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

A

SCN^{$ - $} < F^{$ - $} < CN^{$ - $} < C₂O₄^2-

B

F^{$ - $} < SCN^{$ - $} < C₂O₄^2- < CN^{$ - $}

C

CN^{$ - $} < C₂O₄^2- SCN^{$ - $} < F^{$ - $}

D

SCN^{$ - $} < F^{$ - $} < C₂O₄^2- < CN^{$ - $}

Question 33: Palette 33/107

NEET 2019 MCQ

What is the correct electronic configuration of the central atom in K₄[Fe(CN)₆] based on crystal field theory?

A

$t_{2g}^4e_g^2$

B

$t_{2g}^6e_g^0$

C

${e^3}t_2^3$

D

${e^4}t_2^2$

Question 34: Palette 34/107

NEET 2018 MCQ

Iron carbonyl, Fe(CO)₅ is

A

tetranuclear

B

mononuclear

C

trinuclear

D

dinuclear

Question 35: Palette 35/107

NEET 2018 MCQ

The geometry and magnetic behaviour of the complex [Ni(CO)₄] are

A

square planar geometry and diamagnetic

B

tetrahedral geometry and diamagnetic

C

square planar geometry and paramagnetic

D

tetrahedral geometry and paramagnetic.

Question 36: Palette 36/107

NEET 2018 MCQ

The type of isomerism shown by the complex [CoCl₂(en)₂] is

A

geometrical isomerism

B

coordination isomerism

C

ionization isomerism

D

linkage isomerism.

Question 37: Palette 37/107

NEET 2017 MCQ

An example of a sigma bonded organometallic compound is

A

Grignard's reagent

B

ferrocene

C

cobaltocene

D

ruthenocene.

Question 38: Palette 38/107

NEET 2017 MCQ

Pick out the correct statement with respect to [Mn(CN)₆]^3$-$.

A

It is sp³d² hybridised and tetrahedral.

B

It is d²sp³ hybridised and octahedral.

C

It is dsp² hybridised and square planar.

D

It is sp³d² hybridised and octahedral.

Question 39: Palette 39/107

NEET 2017 MCQ

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is

A

[Co(H₂O)₆]³⁺, [Co(en)₃]³⁺, [Co(NH₃)₆]³⁺

B

[Co(H₂O)₆]³⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺

C

[Co(NH₃)₆]³⁺, [Co(en)₃]³⁺, [Co(H₂O)₆]³⁺

D

[Co(en)₃]³⁺, [Co(NH₃)₆]³⁺, [Co(H₂O)₆]³⁺

Question 40: Palette 40/107

NEET 2017 MCQ

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes : CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is

A

3AgCl, 1AgCl. 2AgCl

B

3AgCl, 2AgCl, 1AgCl

C

2AgCl, 3AgCl, 2AgCl

D

1AgCl, 3AgCl, 2AgCl

Question 41: Palette 41/107

NEET 2016 MCQ

Jahn-Teller effect is not observed in high spin complexes of

A

d⁷

B

d⁸

C

d⁴

D

d⁹

Question 42: Palette 42/107

NEET 2016 MCQ

The correct increasing order of trans-effect of the following species is

A

NH₃ > CN^$-$ > Br^$-$ > C₆H₅^$-$

B

CN^$-$ > C₆H₅^$-$ > Br^$-$ > NH₃

C

Br^$-$ > CN^$-$ > NH₃ > C₆H₅^$-$

D

CN^$-$ > Br^$-$ > C₆H₅^$-$ > NH₃

Question 43: Palette 43/107

NEET 2016 MCQ

Which of the following has longest C$-$O bond length? (Free C$-$O bond length in CO is 1.128 $\mathop A\limits^o $.)

A

[Fe(CO)₄]^2$-$

B

[Mn(CO)₆]⁺

C

Ni(CO)₄

D

[Co(CO)₄]^$-$

Question 44: Palette 44/107

NEET 2015 MCQ

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be (en = ethylenediamine)

A

1

B

3

C

4

D

2

Question 45: Palette 45/107

NEET 2015 MCQ

The sum of coordination number and oxidation number of the metal M in the complex [M(en)₂(C₂O₄)]Cl (where en is ethylenediamine) is

A

6

B

7

C

8

D

9

Question 46: Palette 46/107

NEET 2015 MCQ

The name of complex ion, [Fe(CN)₆]^3$-$ is

A

hexacyanitoferrate (III) ion

B

tricyanoferrate (III) ion

C

hexacyanidoferrate (III) ion

D

hexacyanoiron (III) ion.

Question 47: Palette 47/107

NEET 2015 MCQ

The hybridization involved in complex [Ni(CN)₄]^$2-$ is (At. No. Ni = 28)

A

sp³

B

d²sp²

C

d²sp³

D

dsp²

Question 48: Palette 48/107

NEET 2015 MCQ

Which of these statements about [Co(CN)₆]^3$-$ is true?

A

[Co(CN)₆]^3$-$ has four unpaired electrons and will be in a high-spin configuration.

B

[Co(CN)₆]^3$-$ has no unpaired electrons and will be in a high-spin configuration.

C

[Co(CN)₆]^3$-$ has no unpaired electrons and will be in a low-spin configuration.

D

[Co(CN)₆]^3$-$ has four unpaired electrons and will be in a low-spin configuration.

Question 49: Palette 49/107

NEET 2015 MCQ

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25^oC?

A

CoCl₃ $ \cdot $ 5NH₃

B

CoCl₃ $ \cdot $ 6NH₃

C

CoCl₃ $ \cdot $ 3NH₃

D

CoCl₃ $ \cdot $ 4NH₃

Question 50: Palette 50/107

NEET 2014 MCQ

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

A

[Mn(H₂O)₆]³⁺

B

[Fe(H₂O)₆]³⁺

C

[Co(H₂O)₆]²⁺

D

[Co(H₂O)₆]³⁺

Question 51: Palette 51/107

NEET 2014 MCQ

Which of the following complexes is used to be as an anticancer agent?

A

mer-[Co(NH₃)₃Cl₃]

B

cis-PtCl₂(NH₃)₂]

C

cis-K₂[PtCl₂Br₂

D

Na₂CoCl₄

Question 52: Palette 52/107

NEET 2013 MCQ

The anion of acetylacetone (acac) forms Co (acac)₃ chelate with Co³⁺. The rings of the chelate are

A

five membered

B

four membered

C

six membered

D

three membered.

Question 53: Palette 53/107

NEET 2013 MCQ

Which is diamagnetic?

A

[Co(F)₆]^3$-$

B

[Ni(CN)₄]^2$-$

C

[NiCl₄]^2$-$

D

[Fe(CN)₆]^3$-$

Question 54: Palette 54/107

NEET 2013 MCQ

Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?

A

Fe₃[Fe(CN)₆]₂

B

Fe₄[Fe(CN)₆]₃

C

Fe₄[Fe(CN)₆]₂

D

Fe₃[Fe(CN)₆]₃

Question 55: Palette 55/107

NEET 2013 MCQ

Crystal field splitting energy for high spin d⁴ octahedral complex is

A

$-$ 1.2 $\Delta $_o

B

$-$ 0.6 $\Delta $₀

C

$-$ 0.8 $\Delta $_o

D

$-$ 1.6 $\Delta $_o

Question 56: Palette 56/107

NEET 2013 MCQ

The correct IUPAC name for [CrF₂(en)₂]Cl is

A

chloro difluorido ethylene diaminechromium (III) chloride

B

difluoridobis (ethylene diamine) chromium (III) chloride

C

difluorobis-(ethylene diamine) chromium (III) chloride

D

chloro difluoridobis (ethylene diamine) chromium (III)

Question 57: Palette 57/107

NEET 2013 MCQ

Which among the following is a paramagnetic complex?

A

[Co(NH₃)₆]³⁺

B

[Pt(en)Cl₂]

C

[CoBr₄]$2-$

D

Mo(CO)₆

Question 58: Palette 58/107

NEET 2013 MCQ

In a particular isomer of [Co(NH₃)₄Cl₂]^o, the Cl$-$Co$-$Cl angle is 90^o, this isomer is known as

A

optical isomer

B

cis-isomer

C

position isomer

D

linkage isomer.

Question 59: Palette 59/107

NEET 2013 MCQ

A magnetic moment at 1.73 BM will be shown by one among of the following

A

TiCl₄

B

[CoCl₆]^4$-$

C

[Cu(NH₃)₄]²⁺

D

[Ni(CN)₄]2^$-$

Question 60: Palette 60/107

NEET 2013 MCQ

An excess of AgNO₃ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitated would be

A

0.003

B

0.01

C

0.001

D

0.002

Question 61: Palette 61/107

NEET 2012 MCQ

Low spin complex of d⁶-cation in an octahedral field will have the following energy

A

${{ - 12} \over 5}{\Delta _o} + P$

B

${{ - 12} \over 5}{\Delta _o} + 3P$

C

${{ - 2} \over 5}{\Delta _o} + 2P$

D

${{ - 2} \over 5}{\Delta _o} + P$

Question 62: Palette 62/107

NEET 2012 MCQ

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true?

A

Red complex has a square planar geometry.

B

Complex has symmetrical H-bonding.

C

Red complex has a tetrahedral geometry.

D

Dimethylglyoxime functions as bidenate ligand.

Question 63: Palette 63/107

NEET 2012 MCQ

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

A

[Ni(NH₃)₆]²⁺

B

[Zn(NH₃)₆]²⁺

C

[Cr(NH₃)₆]³⁺

D

[Co(NH₃)₆]³⁺

Question 64: Palette 64/107

NEET 2011 MCQ

Which of the following complex compounds will exhibit highest paramagnetic behaviour?
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30)

A

[Cr (NH₃)₆] ³⁺

B

[Co (NH₃)₆]³⁺

C

[Zn (NH₃)₆]²⁺

D

[Ti(NH₃)₆] ³⁺

Question 65: Palette 65/107

NEET 2011 MCQ

Which of the following carbonyls will have the strongest C–O bond ?

A

Cr (CO)₆

B

Fe (CO)₅

C

Mn (CO)₆⁺

D

V(CO)₆^-

Question 66: Palette 66/107

NEET 2011 MCQ

The complex, [Pt(Py)(NH₃)BrCl] will have how many geometrical isomers ?

A

3

B

4

C

0

D

2

Question 67: Palette 67/107

NEET 2011 MCQ

Of the following complex ions, which is diamagnetic in nature?

A

[NiCl₄]^2$-$

B

[Ni(CN)₄]^2$-$

C

[CuCl₄]^2$-$

D

[CoF₆]^3$-$

Question 68: Palette 68/107

NEET 2011 MCQ

The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
(At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

A

[Mn(H₂O)₆]²⁺

B

[Fe(H₂O)₆]²⁺

C

[Co(H₂O)₆]²⁺

D

[Cr(H₂O)₆]²⁺

Question 69: Palette 69/107

NEET 2011 MCQ

Which of the following carbonyls will have the strongest C $-$ O bond?

A

Mn(CO)₆⁺

B

Cr(CO)₆

C

V(CO)₆^$-$

D

Fe(CO)₅

Question 70: Palette 70/107

NEET 2011 MCQ

The complexes [Co(NH₃)₆] [Cr(CN)₆] and [Cr(NH₃)₆] [Co(CN)₆] are the examples of which type of isomerism?

A

Linkage isomerism

B

Ionization isomerism

C

Coordination isomerism

D

Geometrical isomerism

Question 71: Palette 71/107

NEET 2011 MCQ

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

A

[Ti(NH₃)₆]³⁺

B

[Cr(NH₃)₆]³⁺

C

[Co(NH₃)₆]³⁺

D

[Zn(NH₃)₆]²⁺

Question 72: Palette 72/107

NEET 2010 MCQ

Which of the following complex ions is not expected to absorb visible light?

A

[Ni(CN)₄]^2$-$

B

[Cr(NH₃)₆]³⁺

C

[Fe(H₂O)₆]²⁺

D

[Ni(H₂O)₆]²⁺

Question 73: Palette 73/107

NEET 2010 MCQ

Crystal field stabilization energy for high spin d⁴ octahedral complex is

A

$-$ 1.8 $\Delta $₀

B

$-$ 1.6 $\Delta $₀ + P

C

$-$ 1.2 $\Delta $₀

D

$-$ 0.6 $\Delta $₀

Question 74: Palette 74/107

NEET 2010 MCQ

The existance of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂]⁺ is due to

A

linkage isomerism

B

geometrical isomerism

C

coordination isomerism

D

ionization isomerism.

Question 75: Palette 75/107

NEET 2010 MCQ

Which one of the following complexes is not expected to exhibit isomerism?

A

[Ni(NH₃)₄(H₂O)₂]²⁺

B

[Pt(NH₃)₂Cl₂]

C

[Ni(NH₃)₂Cl₂]

D

[Ni(en)₃]²⁺

Question 76: Palette 76/107

NEET 2009 MCQ

Out of TiF₆^2$-$, CoF₆^3$-$, Cu₂Cl₂ and NiCl₄^2$-$ (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are

A

Cu₂Cl₂ and NiCl₄^2$-$

B

TiF₆^2$-$ and Cu₂Cl₂

C

CoF₆^3$-$ and NiCl₄^2$-$

D

TiF₆^2$-$ and CoF₆^3$-$

Question 77: Palette 77/107

NEET 2009 MCQ

Which of the following does not show optical isomerism?

(en = ethylenediamine)

A

[Co(NH₃)₃Cl₃]⁰

B

[Co(en)Cl₂(NH₃)₂]⁺

C

[Co(en)₃]³⁺

D

[Co(en)₂Cl₂]⁺

Question 78: Palette 78/107

NEET 2009 MCQ

Which of the following complex ions is expected to absorb visible light?
(At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

A

[Ti(en)₂(NH₃)₂]⁴⁺

B

[Cr(NH₃)₆]³⁺

C

[Zn(NH₃)₆]²⁺

D

[Sc(H₂O)₃(NH₃)₃]³⁺

Question 79: Palette 79/107

NEET 2008 MCQ

Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities.
(At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)

A

[Co(ox)₂(OH)₂]^$-$

B

[Ti(NH₃)₆]³⁺

C

[V(gly)₂(OH)₂(NH₃)₂]⁺

D

[Fe(en)(bpy)(NH₃)₂]²⁺

Question 80: Palette 80/107

NEET 2008 MCQ

In which of the following coordination entities the magnitude of $\Delta $_o (CFSE in octahedral field) will be maximum?
(At. No. Co = 27)

A

[Co(CN)₆]^3$-$

B

[Co(C₂O₄)₃]3^$-$

C

[Co(H₂O)₆]³⁺

D

[Co(NH₃)₆]³⁺

Question 81: Palette 81/107

NEET 2007 MCQ

The d electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Ni²⁺ are 3d⁴, 3d⁵, 3d⁶ and 3d⁸ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

A

[Fe(H₂O)₆]²⁺

B

[Ni(H₂O)₆]²⁺

C

[Cr(H₂O)₆]²⁺

D

[Mn(H₂O)₆]²⁺

Question 82: Palette 82/107

NEET 2007 MCQ

Which of the following will give a pair of enantiomorphs?
(en = NH₂CH₂CH₂NH₂)

A

[Cr(NH₃)₆][Co(CN)₆]

B

[Co(en)₂Cl₂]Cl

C

[Pt(NH₃)₄][PtCl₆]

D

[Co(NH₃)₄Cl₂]NO₂

Question 83: Palette 83/107

NEET 2006 MCQ

[Co(NH₃)₄(NO₂)₂]Cl exhibits

A

linkage isomerism, geometrical isomerism and optical isomerism

B

linkage isomerism, ionization isomerism and optical isomerism

C

linkage isomerism, ionization isomerism and geometrical isomerism

D

ionization isomerism, geometrical isomerism and oprical isomerism.

Question 84: Palette 84/107

NEET 2006 MCQ

[Cr(H₂O)₆]Cl₃ (At. no. of Cr = 24) has a magnetic momen of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

A

$3d_{x\,y}^1,\,3d_{y\,z}^1,\,3d_{z^2}^{1}$

B

$3d_{\left( {x^2 - y^2} \right)}^1,\,3d_{z^2}^1,\,3d_{xz}^1$

C

$3d_{x\,y}^1,\,\,3d_{\left( {x^2 - y^2} \right)}^1,\,3d_{y\,z}^1$

D

$3d_{x\,y}^1,\,3d_{y\,z}^1,\,3d_{x\,z}^1$

Question 85: Palette 85/107

NEET 2005 MCQ

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

A

cis-[Pt(NH₃)₂Cl₂]

B

trans-[Pt(NH₃)₂Cl₂]

C

cis-[Co(en)₂Cl₂]⁺

D

trans-[Co(en)₂Cl₂]⁺

Question 86: Palette 86/107

NEET 2005 MCQ

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?

A

[Zn(NH₃)₆]²⁺

B

[Cr(NH₃)₆]³⁺

C

[Co(NH₃)₆]³⁺

D

[Ni(NH₃)₆]²⁺

Question 87: Palette 87/107

NEET 2004 MCQ

Among [Ni(CO)₄], [Ni(CN)₄]^2$-$, [NiCl₄]^2$-$ species, the hybridisation states at the Ni atom are, respectively
[Atomic number of Ni = 28]

A

sp³, dsp², dsp²

B

sp³, dsp², sp³

C

sp³, sp³, dsp²

D

dsp², sp³, sp³

Question 88: Palette 88/107

NEET 2004 MCQ

Considering H₂O as a weak field ligand, the number of unpaired electrons in [Mn(H₂O)₆]²⁺ will be (atomic number of Mn = 25)

A

three

B

five

C

two

D

four

Question 89: Palette 89/107

NEET 2004 MCQ

Which of the following does not have a metal carbon bond?

A

Al(OC₂H₅)₃

B

C₂H₅MgBr

C

K[Pt (C₂H₄)Cl₃]

D

Ni(CO)₄

Question 90: Palette 90/107

NEET 2004 MCQ

Which of the following is considered to be an anticancer species?

A

B

C

D

Question 91: Palette 91/107

NEET 2004 MCQ

Which of the following coordination compounds would exhibit optical isomerism?

A

Pentaamminenitrocobalt (III) iodide

B

Diamminedichloroplatinum (II)

C

trans-Dicyanobis (ethyleneddiamine) chromium (III) chloride

D

tris-(Ethylenediamine) cobalt (III) bromide.

Question 92: Palette 92/107

NEET 2004 MCQ

CN^$-$ is a strong field ligand. This is due to the fact that

A

it carries negative charge

B

it is a pseudohalide

C

it can accept electrons from metal species

D

it forms high spin complexes with metal species.

Question 93: Palette 93/107

NEET 2004 MCQ

In an octahedral structure, the pair of $d$ orbitals involved in d²sp³ hybridisation is

A

d _x²$-$y², d _z²

B

d _xz, d _x²$-$y²

C

d _z², d _xz

D

d _xy, d _yz

Question 94: Palette 94/107

NEET 2003 MCQ

The number of unpaired electrons in the complex ion [CoF₆]^3$-$ is
(Atomic no. : Co = 27)

A

2

B

3

C

4

D

zero

Question 95: Palette 95/107

NEET 2003 MCQ

Among the following which is not the $\pi $-bonded organometallic compound?

A

K [PtCl₃ ($\eta $² $-$ C₂H₄)]

B

Fe ($\eta $⁵ $-$ C₅H₅)₂

C

Cr ($\eta $⁶ $-$ C₆H₆)₂

D

(CH₃)₄Sn

Question 96: Palette 96/107

NEET 2002 MCQ

In the silver plating of copper, K[Ag(CN)₂] is used instead of AgNO₃. The reason is

A

a thin layer of Ag is formed on Cu

B

more voltage is required

C

Ag⁺ ions are completely removed from solution

D

less availability of Ag⁺ ions, as Cu can not displace Ag from [Ag(CN)₂]^$-$ ion.

Question 97: Palette 97/107

NEET 2002 MCQ

The hypothetical complex chloro diaquatriammine cobalt(III) chloride can be represented as

A

[CoCl(NH₃)₃(H₂O)₂]Cl₂

B

[Co(NH₃)₃(H₂O)Cl₃]

C

[Co(NH₂)₃(H₂O)₂Cl]

D

[Co(NH₃)₃(H₂O)₃]Cl₃

Question 98: Palette 98/107

NEET 2002 MCQ

CuSO₄ when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN, due to formation of the following complex

A

K₂[Cu(CN)₄]

B

K₃[Cu(CN)₄]

C

CuCN₂

D

Cu[KCu(CN)₄].

Question 99: Palette 99/107

NEET 2002 MCQ

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagetic with the spin of electron?

A

[Cr(CO)₆]

B

[Fe(CO)₅]

C

[Fe(CN)₆]^4$-$

D

[Cr(NH₃)₆]³⁺

Question 100: Palette 100/107

NEET 2001 MCQ

Coordination number of Ni in [Ni(C₂O₄)₃]^4$-$ is

A

3

B

6

C

4

D

2

Question 101: Palette 101/107

NEET 2001 MCQ

Which statement is incorrect?

A

Ni(CO)₄ $-$ tetrahedral, paramagnetic

B

Ni(CN)₄ - square planar, diamagnetic

C

Ni(CO)₄ - tetrahedral, diamagnetic

D

[Ni(Cl)₄]^2$-$ - tetrahedral, paramagnetic.

Question 102: Palette 102/107

NEET 2001 MCQ

Which of the following will exhibit maximum ionic conductivity?

A

K₄[Fe(CN)₆]

B

[Co(NH₃)₆]Cl₃

C

[Cu(NH₃)₄]Cl₂

D

[Ni(CO)₄

Question 103: Palette 103/107

NEET 2001 MCQ

Which of the following will give maximum number of isomers?

A

[Co(NH₃)₄Cl₂]

B

[Ni(en)(NH₃)₄]²⁺

C

[Ni(C₂O₄)(en)₂]^2$-$

D

[Cr(SCN)₂(NH₃)₄]⁺

Question 104: Palette 104/107

NEET 2001 MCQ

Which of the following organometallic compounds is $\sigma $ and $\pi $ bonded?

A

[Fe($\eta $⁵ $-$ C₂H₅)₂]

B

K[PtCl₃($\eta $² $-$ C₂H₄)]

C

[Co(CO)₅NH₃]²⁺

D

Fe(CH₃)₃

Question 105: Palette 105/107

NEET 2000 MCQ

In quantitative analysis of second group in laboratory, H₂S gas is passed in acidic medium for precipitation. When Cu²⁺ react with KCN, then for product, true statement is

A

K₂[Cu(CN)₄] more soluble

B

K₂[Cd(CN)₄] less stable

C

K₂[Cu(CN)₂] less stable

D

K₂[Cd(CN)₃] more stable

Question 106: Palette 106/107

NEET 2000 MCQ

Shape of Fe(CO)₅ is

A

octahedral

B

square planar

C

trigonal bipyramidal

D

square pyramidal.

Question 107: Palette 107/107

NEET 2000 MCQ

Which complex compound will give four isomers?

A

[Fe(en)₃]Cl₃

B

[Co(en)₂Cl₂]Cl

C

[Fe(PPh₃)₃NH₃ClBr]Cl

D

[Co(PPh₃)₃Cl]Cl₃