Question 1

Which of the following statements best describes a coordination compound?

Accepted Answer

A compound in which a central metal atom is bonded to a group of surrounding ions or molecules called ligands.

Question 2

Which of the following is a double salt?

Accepted Answer

$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$

Question 3

Which of the following ligands is bidentate?

Accepted Answer

$C_2O_4^{2-}$ (oxalate)

Question 4

What is the oxidation state of cobalt in $[Co(NH_3)_6]Cl_3$?

Accepted Answer

$+3$

Question 5

Which of the following geometries is possible for a coordination number of 4?

Accepted Answer

Tetrahedral and square planar

Question 6

According to Crystal Field Theory, what happens to the $d$-orbitals of a transition metal ion in an octahedral field?

Accepted Answer

They split into two sets: $t_{2g}$ (lower energy) and $e_g$ (higher energy)

Question 7

Which of the following is a limitation of Crystal Field Theory (CFT)?

Accepted Answer

It treats ligands as point charges and ignores covalent character in bonding.

Question 8

Which of the following complexes is expected to be diamagnetic?

Accepted Answer

$[Fe(CN)_6]^{4-}$

Question 9

Calculate the crystal field stabilization energy (CFSE) for a $d^6$ ion in a strong field octahedral complex.

Accepted Answer

$-2.4\Delta_o$

Question 10

Which of the following best explains why $[Ni(CN)_4]^{2-}$ is square planar while $[NiCl_4]^{2-}$ is tetrahedral?

Accepted Answer

CN$^-$ is a strong field ligand causing pairing of electrons, while Cl$^-$ is a weak field ligand.

Question 11

Which of the following is a chelating ligand?

Accepted Answer

$en$ (ethylenediamine)

Question 12

Which of the following is an example of a linkage isomer?

Accepted Answer

$[Co(NH_3)_5(NO_2)]^{2+}$ and $[Co(NH_3)_5(ONO)]^{2+}$

Question 13

Which of the following best describes the color observed in transition metal complexes?

Accepted Answer

It is due to $d$-$d$ transitions caused by absorption of visible light.

Question 14

Which of the following is the correct formula for the calculation of the magnetic moment ($\mu$) in Bohr Magnetons (BM)?

Accepted Answer

$\mu = \sqrt{n(n+2)}$

Question 15

Which of the following is a correct statement about spectrochemical series?

Accepted Answer

It is an arrangement of ligands in order of their field strength.

Question 16

Which of the following is a real-life application of coordination compounds?

Accepted Answer

Cisplatin is used as an anti-cancer drug.

Question 17

Which of the following is a property of a high-spin octahedral complex?

Accepted Answer

It has more unpaired electrons compared to a low-spin complex.

Question 18

Which of the following is the correct expression for the energy of a photon?

Accepted Answer

$E = h
u$

Question 19

Which of the following is an example of ionization isomerism?

Accepted Answer

$[Co(NH_3)_5Br]SO_4$ and $[Co(NH_3)_5SO_4]Br$

Transition Metals and Coordination Compounds: Structure, Bonding, and Properties

Study Guide - Practice Questions