Coordination Compounds · Chemistry · COMEDK

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MCQ (Single Correct Answer)

1

Which one of the following structures in Column I does not have the correct IUPAC name as given in Column II.

S.No. Structure IUPAC name
A. $\left[\mathrm{CoBr}_2(\mathrm{en})_2\right] \mathrm{Cl}$ P. Dibromidodi-( ethan-1, 2 - diamine)cobalt (III) chloride
B. $\mathrm{Na}\left[\mathrm{PtBrCl}\left(\mathrm{NO}_2\right)\left(\mathrm{NH}_3\right)\right]$ Q. Sodium amminebromidochloridonitrito- N - palatinate(II)
C. $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_2\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}\right] \mathrm{SO}_4$ R. Tetraamminediaquachloridochromium (III) sulphate.
D. $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{PtCl}_4\right]$ S. Tetraammineplatinum (II) tetrachloridoplatinate (II)

COMEDK 2025 Afternoon Shift
2
A transition metal M forms 4 homoleptic octahedral coordination compounds, $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D of the type $\left[\mathrm{MX}_6\right]^{z-}$ with monodentate ligands a, b, c and d respectively. These compounds absorb red. blue. yellow and blue-green light respectively. Which one of the options shows the correct order of decreasing ligand strength?
COMEDK 2025 Afternoon Shift
3
Choose the coordination compound which does not exhibit Optical activity.
COMEDK 2025 Afternoon Shift
4
The correct order of spin only magnetic moments among the following is: [Given: Atomic numbers: $\mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27$ ]
COMEDK 2025 Afternoon Shift
5
An aqueous solution of $\mathrm{CrCl}_3 .6 \mathrm{H}_2 \mathrm{O}$ (Molar mass $=266.5 \mathrm{~g} / \mathrm{mol}$ ) containing 2.665 g of the solute after processing, when treated with excess of $\mathrm{AgNO}_3$ gave 2.87 g of AgCl (Molar mass of $\mathrm{AgCl}=143.5 \mathrm{~g} / \mathrm{mol}$ ) Choose the correct formula of the compound which give these results.
COMEDK 2025 Morning Shift
6
Which one of the following coordination compounds will exhibit both geometrical and optical isomerism?
COMEDK 2025 Morning Shift
7

Arrange the following compounds in the decreasing order of the molar conductivities of their aqueous solutions.

A B C D
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$ $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$ $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl}$ $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$

COMEDK 2025 Morning Shift
8

Match the coordination compounds in Column I having the given type of hybridisation of $\mathrm{M}^{\mathrm{n}+}$ ion and magnetic moment as given in Column II.

Coordination compounds Hybridisation & Magnetic nature
A. $\mathrm{Ni}(\mathrm{CO})_4$ P. $\mathrm{sp}^3, \quad \mu=5.92 \mathrm{BM}$
B. $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ Q. $\mathrm{sp}^3, \quad \mu=2.84 \mathrm{BM}$
C. $\left[\mathrm{Ni}(\mathrm{Cl})_4\right]^{2-}$ R. $\mathrm{sp}^3, \quad \mu=0$
D. $\left[\mathrm{MnBr}_4\right]^{2-}$ S. $\mathrm{dsp}^2, \quad \mu=0$

COMEDK 2025 Morning Shift
9

Which of the following 2 compounds exhibit both Geometrical and Structural isomerism?

$$\begin{aligned} & \mathrm{A}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{NO}_2 \\ & \mathrm{~B}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right) \mathrm{Br}\right] \mathrm{SO}_4 \\ & \mathrm{C}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_2\right)_3\right] \\ & \mathrm{D}=\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3 \end{aligned}$$

COMEDK 2024 Evening Shift
10

Based on Valence Bond Theory, match the complexes listed in Column I with the number of unpaired electrons on the central metal ion, given in Column II

No. Complex ions No. Number of unpaired electrons
(A) $$
\left[\mathrm{Fe} \mathrm{F}_6\right]^{3-}
$$
(P) 0
(B) $$
\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}
$$
(P) 1
(C) $$
\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}
$$
(R) 5
(D) $$
\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}
$$
(S) 4

COMEDK 2024 Evening Shift
11

Given below are 4 statements. Two of these are correct statements. Identify them.

A. $$\mathrm{Co}^{2+}$$ is easily oxidised to $$\mathrm{Co}^{3+}$$ in the presence of a strong ligand like $$\mathrm{CN}^{-}$$

B. $$[\mathrm{Fe}(\mathrm{CN})_6]^{4-}$$ is an octahedral complex ion which is paramagnetic in nature.

C. Removal of $$\mathrm{H}_2 \mathrm{O}$$ molecules from $$[\mathrm{Ti}(\mathrm{H}_2 \mathrm{O})_6] \mathrm{Cl}_3$$ on strong heating converts it to a colourless compound.

D. Crystal Field splitting in Octahedral and Tetrahedral complexes is given by the equation $$\Delta_0=4 / 9 \Delta_t$$

COMEDK 2024 Evening Shift
12

Based on Crystal Field theory, match the Complex ions listed in Column I with the electronic configuration in the d orbitals of the central metal ion listed in Column II.

No. Complexion No. d orbital configuration of central metal ion.
(A) $$
\left[M n(C N)_6\right]^{4-}
$$
(P) $$
e_g^2 t_{2 g}^3
$$
(B) $$
\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}
$$
(Q) $$
t_{2 g}^4 e_g^2
$$
(C) $$
\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}
$$
(R) $$
t_{2 g}^5
$$
(D) $$
\left[\mathrm{MnCl}_4\right]^{2-}
$$
(S) $$
t_{2 g}^5 e_g^2
$$

COMEDK 2024 Evening Shift
13

On the basis of crystal field theory, electronic configuration of a low spin $$\mathrm{d}^4$$ complex is:

COMEDK 2024 Afternoon Shift
14

The molar conductivity of the complex $$\mathrm{CoCl}_3 \cdot 4 \mathrm{NH}_3 \cdot 2 \mathrm{H}_2 \mathrm{O}$$ is found to be the same as that of a $$1: 3$$ electrolyte. The structural formula of the compound is :

COMEDK 2024 Afternoon Shift
15

The type of hybridisation and the spin only magnetic moment for the complex $$[\mathrm{Ni}(\mathrm{CO})_4]$$ are respectively:

COMEDK 2024 Afternoon Shift
16

A d - block metal $$\mathrm{X}(\mathrm{Z}=26)$$ forms a compound $$[\mathrm{X}(\mathrm{CN})_2(\mathrm{CO})_4]^{+}$$. Calculate its spin magnetic moment value.

COMEDK 2024 Morning Shift
17

A Coordination compound is represented by the formula $$[\mathrm{CoBr}_3(e n) x]$$. This compound required one mole of $$\mathrm{AgNO}_3$$ to form a pale yellow precipitate of $$\mathrm{AgBr}$$. What is the value of $$\mathrm{x}$$ in the compound?

COMEDK 2024 Morning Shift
18

Choose the incorrect statement from the following.

COMEDK 2024 Morning Shift
19

Which among the following is diamagnetic?

COMEDK 2023 Morning Shift
20

The complex $$\left[\mathrm{PtCl}_2(\mathrm{en})_2\right]^{2+}$$ ion shows

COMEDK 2023 Morning Shift
21

The blue colouration obtained from the Lassaigne's test of nitrogen is due to the formation of

COMEDK 2023 Morning Shift
22

Aqueous $$\mathrm{CuSO}_4$$ changes its colour from sky blue to deep blue on addition of $$\mathrm{NH}_3$$ because

COMEDK 2023 Morning Shift
23

Which of the following complex show optical isomerism?

(i) $$c i s-\left[\mathrm{COCl}(\mathrm{en})_2\left(\mathrm{NH}_3\right)\right]^{2+}$$

(ii) $$cis-\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}$$

(iii) $$cis-[ \left.\mathrm{CO}(\mathrm{en})_2 \mathrm{Cl}_2\right] \mathrm{Cl}$$

(iv) $$cis- \left[\mathrm{CO}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$$

COMEDK 2023 Morning Shift
24

Mohr's salt has the formula

COMEDK 2023 Morning Shift
25

Identify the correct IUPAC name of $$[\mathrm{CoCl}_2(\mathrm{NO}_2)(\mathrm{NH}_3)_3]$$

COMEDK 2023 Evening Shift
26

Match the Coordination compounds given in Column I with their characteristic features listed in Column II.

S.No. Coordination compounds S.No. Characteristic features
W $$
\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_3
$$
P $$
\text { Oxidation state }=+3 \text { Configuration }=\mathrm{d}^5 \quad \mu=5.92 \mathrm{BM}
$$
X $$
\mathrm{K}_4\left[\mathrm{Mn}(\mathrm{CN})_6\right.
$$
Q $$
\text { Oxidation state }=+3 \text { Configuration }=\mathrm{d}^3 \quad \mu=3.87 \mathrm{BM}
$$
Y $$
\left[\mathrm{CrCl}_3(\mathrm{py})_3\right]
$$
R $$
\text { Oxidation state }=+3 \text { Configuration }=d^6 \quad \mu=0 \mathrm{BM}
$$
Z $$
\mathrm{Cs}\left[\mathrm{FeCl}_4\right]
$$
S $$
\text { Oxidation state }=+2 \text { Configuration }=\mathrm{d}^5 \quad \mu=1.732 \mathrm{BM}
$$

COMEDK 2023 Evening Shift
27

Which one of the following is an incorrect statement pertaining to the properties of Coordination compounds?

COMEDK 2023 Evening Shift
28

Which one of the following Coordination entities exhibits Facial and Meridional isomerism?

COMEDK 2023 Evening Shift
29

The complex which does not show optical isomerism is

COMEDK 2022
30

The oxidation state of nickel in [Ni(CO$$_4$$)] is

COMEDK 2022
31

Which type of ligand is EDTA?

COMEDK 2021
32

The correct IUPAC name of the coordination compound K$$_3$$[Fe(CN)$$_5$$NO] is

COMEDK 2021
33

IUPAC name of Na$$_3$$[Co(NO$$_2$$)$$_6$$] is

COMEDK 2020
34

The number of unidentate ligands in the complex ion is called

COMEDK 2020
35

The oxidation state of iron in K$$_4$$[Fe(CN)$$_6$$] is,

COMEDK 2020
36

Which complex cannot ionise in solution?

COMEDK 2020
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