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Coordination Compounds: questions with answers

Class 12 Chemistry, Chapter 5 (NCERT). 15 questions by concept. Open “Show answer” for the answer and why.

How to teach this chapter · Common misconceptions & worked visual for this chapter

Werner theory and coordination terminology

Question 1

Which statement gives the sound Class XII chemistry for ‘Werner theory and coordination terminology’?

  1. (a)The same conclusion about werner theory and coordination terminology remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  2. (b)Only the name of the substance is needed for werner theory and coordination terminology; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  3. (c)A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.
  4. (d)For werner theory and coordination terminology, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(c) A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.

A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.

Question 2

Which principle should be retained when checking an inference about ‘Werner theory and coordination terminology’?

  1. (a)A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.
  2. (b)The same conclusion about werner theory and coordination terminology remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  3. (c)Only the name of the substance is needed for werner theory and coordination terminology; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  4. (d)For werner theory and coordination terminology, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(a) A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.

A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.

Question 3

Which statement correctly governs a new case involving werner theory and coordination terminology?

  1. (a)The same conclusion about werner theory and coordination terminology remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  2. (b)A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.
  3. (c)For werner theory and coordination terminology, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
  4. (d)Only the name of the substance is needed for werner theory and coordination terminology; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer

(b) A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.

A coordination entity contains a central metal bonded to ligands within the coordination sphere. Werner's primary valency corresponds to oxidation state and is ionisable, while secondary valency corresponds to coordination number and has fixed spatial direction.

Nomenclature and formulae of coordination compounds

Question 4

Which statement gives the sound Class XII chemistry for ‘Nomenclature and formulae of coordination compounds’?

  1. (a)Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.
  2. (b)The same conclusion about nomenclature and formulae of coordination compounds remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  3. (c)For nomenclature and formulae of coordination compounds, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
  4. (d)Only the name of the substance is needed for nomenclature and formulae of coordination compounds; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer

(a) Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.

Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.

Question 5

Which principle should be retained when checking an inference about ‘Nomenclature and formulae of coordination compounds’?

  1. (a)Only the name of the substance is needed for nomenclature and formulae of coordination compounds; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  2. (b)The same conclusion about nomenclature and formulae of coordination compounds remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  3. (c)Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.
  4. (d)For nomenclature and formulae of coordination compounds, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(c) Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.

Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.

Question 6

Which statement correctly governs a new case involving nomenclature and formulae of coordination compounds?

  1. (a)Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.
  2. (b)The same conclusion about nomenclature and formulae of coordination compounds remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  3. (c)Only the name of the substance is needed for nomenclature and formulae of coordination compounds; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  4. (d)For nomenclature and formulae of coordination compounds, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(a) Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.

Coordination names list ligands alphabetically before the metal, give metal oxidation state in Roman numerals, and use an -ate metal name for anionic complexes. Formula charge balances ligand charges, metal oxidation state, and counter-ions.

Valence bond theory and magnetic behaviour

Question 7

Which statement gives the sound Class XII chemistry for ‘Valence bond theory and magnetic behaviour’?

  1. (a)Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.
  2. (b)Only the name of the substance is needed for valence bond theory and magnetic behaviour; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  3. (c)For valence bond theory and magnetic behaviour, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
  4. (d)The same conclusion about valence bond theory and magnetic behaviour remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
Show answer

(a) Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.

Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.

Question 8

Which principle should be retained when checking an inference about ‘Valence bond theory and magnetic behaviour’?

  1. (a)The same conclusion about valence bond theory and magnetic behaviour remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  2. (b)Only the name of the substance is needed for valence bond theory and magnetic behaviour; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  3. (c)Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.
  4. (d)For valence bond theory and magnetic behaviour, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(c) Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.

Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.

Question 9

Which statement correctly governs a new case involving valence bond theory and magnetic behaviour?

  1. (a)Only the name of the substance is needed for valence bond theory and magnetic behaviour; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  2. (b)Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.
  3. (c)The same conclusion about valence bond theory and magnetic behaviour remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  4. (d)For valence bond theory and magnetic behaviour, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(b) Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.

Valence bond descriptions assign hybridisation and inner- or outer-orbital use after considering ligand strength and pairing. The number of unpaired electrons determines paramagnetism and spin-only magnetic moment.

Crystal-field splitting, colour, and spin

Question 10

Which statement gives the sound Class XII chemistry for ‘Crystal-field splitting, colour, and spin’?

  1. (a)Ligand fields split metal d orbitals according to geometry. Whether electrons pair depends on splitting relative to pairing energy; d–d absorption can produce colour, while d0 and d10 complexes lack such transitions.
  2. (b)For crystal-field splitting, colour, and spin, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
  3. (c)The same conclusion about crystal-field splitting, colour, and spin remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  4. (d)Only the name of the substance is needed for crystal-field splitting, colour, and spin; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer

(a) Ligand fields split metal d orbitals according to geometry. Whether electrons pair depends on splitting relative to pairing energy; d–d absorption can produce colour, while d0 and d10 complexes lack such transitions.

Ligand fields split metal d orbitals according to geometry. Whether electrons pair depends on splitting relative to pairing energy; d–d absorption can produce colour, while d0 and d10 complexes lack such transitions.

Question 11

Which principle should be retained when checking an inference about ‘Crystal-field splitting, colour, and spin’?

  1. (a)The same conclusion about crystal-field splitting, colour, and spin remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  2. (b)Ligand fields split metal d orbitals according to geometry. Whether electrons pair depends on splitting relative to pairing energy; d–d absorption can produce colour, while d0 and d10 complexes lack such transitions.
  3. (c)Only the name of the substance is needed for crystal-field splitting, colour, and spin; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  4. (d)For crystal-field splitting, colour, and spin, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(b) Ligand fields split metal d orbitals according to geometry. Whether electrons pair depends on splitting relative to pairing energy; d–d absorption can produce colour, while d0 and d10 complexes lack such transitions.

Ligand fields split metal d orbitals according to geometry. Whether electrons pair depends on splitting relative to pairing energy; d–d absorption can produce colour, while d0 and d10 complexes lack such transitions.

Metal carbonyls, stability, and applications

Question 12

Which statement gives the correct Class XII chemistry for ‘Metal carbonyls, stability, and applications’?

  1. (a)For metal carbonyls, stability, and applications, the direction, trend, order of products, or cause-and-effect relation is always the exact reverse of the governing rule.
  2. (b)Only the name of the substance is needed for metal carbonyls, stability, and applications; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  3. (c)The same conclusion about metal carbonyls, stability, and applications remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  4. (d)Metal carbonyl bonding combines ligand-to-metal sigma donation with metal-to-ligand pi back-bonding. Coordination compounds are important in analysis, extraction, catalysis, biology, and medicine; stability depends on metal–ligand equilibria and chelation.
Show answer

(d) Metal carbonyl bonding combines ligand-to-metal sigma donation with metal-to-ligand pi back-bonding. Coordination compounds are important in analysis, extraction, catalysis, biology, and medicine; stability depends on metal–ligand equilibria and chelation.

Metal carbonyl bonding combines ligand-to-metal sigma donation with metal-to-ligand pi back-bonding. Coordination compounds are important in analysis, extraction, catalysis, biology, and medicine; stability depends on metal–ligand equilibria and chelation.

Question 13

Which principle should be kept in mind when checking a conclusion about ‘Metal carbonyls, stability, and applications’?

  1. (a)For metal carbonyls, stability, and applications, the direction, trend, order of products, or cause-and-effect relation is always the exact reverse of the governing rule.
  2. (b)Metal carbonyl bonding combines ligand-to-metal sigma donation with metal-to-ligand pi back-bonding. Coordination compounds are important in analysis, extraction, catalysis, biology, and medicine; stability depends on metal–ligand equilibria and chelation.
  3. (c)The same conclusion about metal carbonyls, stability, and applications remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  4. (d)Only the name of the substance is needed for metal carbonyls, stability, and applications; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer

(b) Metal carbonyl bonding combines ligand-to-metal sigma donation with metal-to-ligand pi back-bonding. Coordination compounds are important in analysis, extraction, catalysis, biology, and medicine; stability depends on metal–ligand equilibria and chelation.

Metal carbonyl bonding combines ligand-to-metal sigma donation with metal-to-ligand pi back-bonding. Coordination compounds are important in analysis, extraction, catalysis, biology, and medicine; stability depends on metal–ligand equilibria and chelation.

Structural and stereoisomerism

Question 14

Which statement gives the sound Class XII chemistry for ‘Structural and stereoisomerism’?

  1. (a)Only the name of the substance is needed for structural and stereoisomerism; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  2. (b)Coordination compounds show ionisation, hydrate, linkage, and coordination isomerism as well as geometrical and optical stereoisomerism. Geometry and ligand arrangement, not formula alone, determine the possible isomers.
  3. (c)The same conclusion about structural and stereoisomerism remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  4. (d)For structural and stereoisomerism, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer

(b) Coordination compounds show ionisation, hydrate, linkage, and coordination isomerism as well as geometrical and optical stereoisomerism. Geometry and ligand arrangement, not formula alone, determine the possible isomers.

Coordination compounds show ionisation, hydrate, linkage, and coordination isomerism as well as geometrical and optical stereoisomerism. Geometry and ligand arrangement, not formula alone, determine the possible isomers.

Question 15

Which principle should be retained when checking an inference about ‘Structural and stereoisomerism’?

  1. (a)The same conclusion about structural and stereoisomerism remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
  2. (b)For structural and stereoisomerism, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
  3. (c)Only the name of the substance is needed for structural and stereoisomerism; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
  4. (d)Coordination compounds show ionisation, hydrate, linkage, and coordination isomerism as well as geometrical and optical stereoisomerism. Geometry and ligand arrangement, not formula alone, determine the possible isomers.
Show answer

(d) Coordination compounds show ionisation, hydrate, linkage, and coordination isomerism as well as geometrical and optical stereoisomerism. Geometry and ligand arrangement, not formula alone, determine the possible isomers.

Coordination compounds show ionisation, hydrate, linkage, and coordination isomerism as well as geometrical and optical stereoisomerism. Geometry and ligand arrangement, not formula alone, determine the possible isomers.

Common misconception in Coordination Compounds

Open full misconception guide →

Is coordination number the number of ligands?

Wrong

In [Co(en)₃]³⁺, the coordination number is 3 because there are three ligands.

Why it feels right. Each ligand is written as a single unit in the formula.

Right

Count donor atoms directly bonded to the metal. A ligand can supply more than one.

Worked example

Three ligands
en · NN
en · NN
en · NN
Coordination count
2+2+2
6
Each ethylenediamine ligand supplies two nitrogen donors, making six donor atoms around cobalt.
  1. Each ethylenediamine ligand binds through two nitrogen atoms.
  2. Three such ligands supply 3 × 2 = 6 donor atoms.