Class 12 Chemistry MCQ Chapter 5 Coordination Compounds
Are you searching for AHSEC Class 12 Chemistry MCQ Chapter 5 Coordination Compounds English Medium? If yes, then you are in the right place. This article provides a complete collection of Multiple Choice Questions (MCQs) with accurate answers and detailed explanations from Chapter 5: Coordination Compounds for AHSEC Higher Secondary students.
These MCQ solutions are prepared according to the latest AHSEC syllabus and examination pattern. The questions cover all important topics of Coordination Compounds, including ligands, coordination number, nomenclature, bonding theories, Werner’s coordination theory, isomerism, stability of coordination compounds, and their applications in chemistry and daily life. Regular practice of these objective questions will help students strengthen their conceptual understanding and improve their performance in examinations.
All questions and answers are written in simple and easy-to-understand English, making them suitable for quick revision and effective exam preparation. Whether you are preparing for unit tests, school examinations, competitive exams, or the AHSEC Higher Secondary Final Examination, these MCQ solutions will help you build confidence and score higher marks.
Practice these Chapter 5 Coordination Compounds MCQs regularly to improve accuracy, strengthen concepts, and achieve better results in Chemistry examinations.
Part I
Coordination Compounds
VSA & MCQ
I. Short Question-Answer
Q. What is a coordination compound?
Ans: A compound in which a central metal atom or ion is surrounded by ligands through coordinate bonds.
Q. What is a ligand?
Ans: An ion or molecule that donates a pair of electrons to the metal ion.
Q. What is coordination number?
Ans: Number of ligand donor atoms directly attached to the central metal ion.
Q. What is coordination sphere?
Ans: The central metal atom and ligands enclosed within square brackets.
Q. What is a complex ion?
Ans: A charged coordination entity.
Q. What is a double salt?
Ans: A compound that dissociates completely into ions in solution.
Q. What is a chelating ligand?
Ans: A ligand that forms more than one bond with the metal ion.
Q. What is a unidentate ligand?
Ans: A ligand that donates one pair of electrons.
Q. What is a bidentate ligand?
Ans: A ligand that donates two pairs of electrons.
Q. What is oxidation state of central metal?
Ans: Charge on the metal ion after removing ligands.
Q. What is Werner’s theory?
Ans: It explains primary and secondary valencies in coordination compounds.
Q. What is primary valency?
Ans: It is ionizable and corresponds to oxidation state.
Q. What is secondary valency?
Ans: It is non-ionizable and equals coordination number.
Q. What is ionisation isomerism?
Ans: Isomerism due to exchange of ions inside and outside coordination sphere.
Q. What is hydrate isomerism?
Ans: Isomerism due to different number of water molecules.
Q. What is linkage isomerism?
Ans: Isomerism due to different bonding atoms of ligand.
Q. What is geometrical isomerism?
Ans: Isomerism due to different spatial arrangement.
Q. What is optical isomerism?
Ans: Isomerism due to non-superimposable mirror images.
Q. What is crystal field theory?
Ans: Theory explaining splitting of d-orbitals in ligand field.
Q. What is crystal field splitting energy (Δ)?
Ans: Energy difference between split d-orbitals.
Q. What are strong field ligands?
Ans: Ligands causing large splitting of d-orbitals.
Q. What are weak field ligands?
Ans: Ligands causing small splitting.
Q. What is spectrochemical series?
Ans: Arrangement of ligands based on field strength.
Q. What is hybridisation in complexes?
Ans: Mixing of orbitals to form bonds.
Q. What is inner orbital complex?
Ans: Complex using (n−1)d orbitals.
Q. What is outer orbital complex?
Ans: Complex using nd orbitals.
Q. What is coordination entity?
Ans: The species inside square brackets.
Q. What is ligand field theory?
Ans: Modified crystal field theory considering covalent character.
Q. What is stability of complex?
Ans: Tendency to retain its identity.
Q. What is formation constant (Kf)?
Ans: Equilibrium constant for complex formation.
II. Multiple Choice Questions (MCQs)
Q. Ligands donate:
(a) Protons
(b) Electrons
(c) Neutrons
(d) Energy
Ans: (b)
Q. Coordination number of [Co(NH3)6]³⁺ is:
(a) 3
(b) 4
(c) 6
(d) 2
Ans: (c)
Q. NH3 is a:
(a) Anion
(b) Neutral ligand
(c) Cation
(d) Metal
Ans: (b)
Q. CN⁻ is a:
(a) Neutral ligand
(b) Cation
(c) Anionic ligand
(d) Gas
Ans: (c)
Q. Chelating ligand forms:
(a) One bond
(b) Multiple bonds
(c) No bond
(d) Ionic bond
Ans: (b)
Q. Primary valency is:
(a) Non-ionizable
(b) Ionizable
(c) Neutral
(d) Fixed
Ans: (b)
Q. Secondary valency is:
(a) Ionizable
(b) Non-ionizable
(c) Zero
(d) Negative
Ans: (b)
Q. Geometrical isomerism occurs in:
(a) Square planar
(b) Tetrahedral
(c) Linear
(d) Monoatomic
Ans: (a)
Q. Optical isomers are:
(a) Identical
(b) Mirror images
(c) Same
(d) Equal
Ans: (b)
Q. Strong field ligands cause:
(a) Small splitting
(b) Large splitting
(c) No splitting
(d) Equal splitting
Ans: (b)
Q. Weak field ligands cause:
(a) Large splitting
(b) Small splitting
(c) No splitting
(d) Infinite splitting
Ans: (b)
Q. Crystal field theory explains:
(a) Bond length
(b) Colour and magnetism
(c) Mass
(d) Density
Ans: (b)
Q. Formation constant indicates:
(a) Instability
(b) Stability
(c) Size
(d) Colour
Ans: (b)
Q. Assertion: Ligands donate electron pairs.
Reason: They act as Lewis bases.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Coordination number depends on ligands.
Reason: Number of donor atoms determines it.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: Strong field ligands pair electrons.
Reason: Large splitting energy.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
Q. Assertion: Optical isomers rotate plane polarized light.
Reason: They are non-superimposable.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (a)
Q. Assertion: Chelating ligands increase stability.
Reason: Ring formation stabilizes complex.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Primary valency is ionizable.
Reason: It equals oxidation state.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: Formation constant measures stability.
Reason: Higher Kf means more stable complex.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
