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1. A coordination complex’s core atom/ion is also known as ________
a) Bronsted-Lowry acid
b) Lewis base
c) Lewis acid
d) Bronsted-Lowry base
Answer: cExplanation: A Lewis acid is a species that has the ability to receive an electron pair. Lewis acids are all cations. It is a Lewis acid because the core atom of a coordination complex is metal and always accepts electrons.
2. Which of the following has a coordination number as a feature?
a) Coordination entity
b) Ligand
c) Central atom
d) Coordination compound
Answer: c
Explanation: The coordination number of a central metal ion in a complex, also known as the secondary valency, is defined as the number of donor atoms it is directly bound to. As a result, the coordination number is a quantity related to the metal ion.
3. Which of the following statements about coordination compounds’ bonding is incorrect?
a) Crystal Field Theory
b) VSEPR Theory
c) Valence Bond Theory
d) Molecular Orbital Theory
Answer: b
Explanation: The VSEPR Theory uses electron pairs in atoms to explain the structure of particular molecules. The theories VBT, CFT, LFT, and MOT explain the nature of bonding in coordination compounds.
4. More than one sort of hybridization can occur in a complex with geometry.
a) tetrahedral
b) octahedral
c) trigonal bipyramidal
d) square planar
Answer: b
Explanation: Depending on whether the outer or inner d orbitals are engaged in hybridisation, complexes with octahedral geometry can have either sp3d2 or d2sp3 hybridisation.
5. Determine which of the following statements about VBT is inaccurate.
a) It does not explain the colour of coordination compounds
b) It can distinguish between strong and weak ligands
c) It does not explain the kinetic stabilities of coordination compounds
d) It is unreliable in the prediction of geometries of 4-coordinate complexes
Answer: b
Explanation: One of VBT’s flaws is that it can’t tell the difference between weak and powerful ligands. Other options have their own set of drawbacks.
6. Which of the following determines the position of ligands in a mononuclear coordination entity’s formula?
a) Atomicity of the ligand
b) Charge on the ligand
c) The first letter in the name of the ligand
d) Denticity of the ligand
Answer: c
Explanation: The alphabetical order of the ligands in the formula of mononuclear coordination entities, including shortened ligands, is used. It is independent of the ligand’s atomicity, denticity, or charge.
7. Which of the following statements about a charged coordinating entity is correct?
a) The sign of the charge is written after the number
b) The charge of the complex ion is written in parenthesis while naming the entity
c) The charge is indicated as a subscript outside the square bracket on the right
d) The charge on the complex ion is depicted along with the counter ion
Answer: a
Explanation: The charge of a coordination entity is written outside the square brackets on the right side as a superscript with the number before the sign of charge, without the existence of the counter ion.
8. Determine the proper name for K2[PdCl4].
a) Potassium tetrachlorinepalladium(II)
b) Potassium tetrachloridopalladate(II)Potassium
c) Potassium tetrachloridopalladium(II)
d) tetrachlorinepalladate(II)
Answer: b
Explanation: Because Cl is an anionic ligand, it has the suffix -o, therefore chlorido. Furthermore, because the complex ion is anionic, the metal must end in -ate, so palladate.
9. Which substance is used to determine the hardness of water using a simple titration?
a) Mg(EDTA)
b) Fe(EDTA)
c) Na2(EDTA)
d) Co(EDTA)
Answer: c
Explanation: With EDTA, the ions Ca2+ and Mg2+ form stable complexes, and the difference in the stability constants of the Ca and Mg complexes aids in the assessment of water hardness.
10. The core atom of which of the following biologically significant coordination molecules is magnesium?
a) Vitamin B12
b) Haemoglobin
c) Chlorophyll
d) Carboxypeptidase-A
Answer: c
Explanation: Chlorophyll is a coordination molecule of magnesium that is found in plants and is important for photosynthesis.
