Coordination Compounds Mock Test

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Quiz: Coordination Compounds – Progressive Test
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1 / 50

1. Assertion: A standard square-planar complex is often diamagnetic.
Reason: Electron pairing can place eight electrons in four orbitals and leave one inner orbital vacant for hybridisation.

a) Assertion is false, but Reason is true

b) Both Assertion and Reason are true, and Reason explains Assertion

c) Assertion is true, but Reason is false

d) Both Assertion and Reason are true, but Reason does not explain Assertion

2 / 50

2. The supported conclusions for are:

a) Cobalt is , oxalato is monodentate, and the coordination number is

b) Cobalt is , the complex is tetrahedral, and geometrical isomerism gives cis and trans forms

c) Cobalt(III), bidentate oxalato, coordination number , optical isomerism possible

d) Cobalt is , the complex is cationic, and the metal is named cobalt

3 / 50

3. Suitable metal ions commonly form square-planar complexes with strong-field ligands because the ligands can:

a) force the coordination number to become

b) pair electrons to free one inner orbital

c) convert every metal electron into a ligand electron

d) prevent the and orbitals from participating

4 / 50

4. For , the charge on the coordination entity and the oxidation state of platinum are respectively:

a) and

b) and

c) and

d) and

5 / 50

5. A coordination entity has the general formula , where every is neutral and every carries charge . The oxidation state of is:

6 / 50

6. Study the ligand comparisons made for the same metal ion under similar conditions.

Row	Ligand system	Feature	Likely stability influence
P	Six monodentate donors	Six separate ligand molecules	No chelate rings
Q	Three bidentate donors	Three ligand molecules	Three chelate rings may form
R	One hexadentate donor	One ligand molecule	Several donor atoms hold the metal
S	One monodentate donor	One donor atom	Must always be more stable than every chelate

The inconsistent row is:

a) Q

b) S

c) P

d) R

7 / 50

7. A pair of enantiomers placed in an achiral environment generally has:

a) same physical properties but opposite optical rotation

b) different metal–ligand connectivities

c) different molecular formulas and different molar masses

d) different coordination numbers and oxidation states

8 / 50

8. Which formula corresponds to diamminedichloridoplatinum(II)?

9 / 50

9. A chelating agent is administered in a case of metal poisoning. Its intended function is to:

a) bind the toxic metal through several donors for easier removal

b) increase the free concentration of the toxic metal ion in body fluids

c) prevent the metal from forming any chemical bond during excretion

d) convert the toxic element into an element with a lower atomic number

10 / 50

10. A complex has three unpaired electrons. Its spin-only magnetic moment is closest to:

11 / 50

11. Three statements describe how denticity affects coordination. Identify the valid combination.
Statement I: An ambidentate ligand may possess two potential donor atoms.
Statement II: A bidentate ligand normally uses two donor atoms simultaneously to bind one metal centre.
Statement III: Each ambidentate ligand necessarily contributes to the coordination number.
The valid statements are:

a) II and III only

b) I, II and III

c) I and III only

d) I and II only

12 / 50

12. Match each metal ion in Column I with its -electron configuration in Column II.

Column I	Column II
P.	1.
Q.	2.
R.	3.
S.	4.

a) P-1, Q-3, R-2, S-4

b) P-3, Q-1, R-4, S-2

c) P-4, Q-2, R-3, S-1

d) P-3, Q-4, R-1, S-2

13 / 50

13. The name of is:

a) potassium tris(oxalato)cobaltate(III)

b) potassium tris(oxalato)cobalt(III)

c) tripotassium trioxalatocobalt(III)

d) potassium tris(oxalato)cobaltate(II)

14 / 50

14. A metal has oxidation state in . The complex is combined with nitrate counter ions to form a neutral compound. The value of and the complete formula are:

a) and

b) and

c) and

d) and

15 / 50

15. Consider the following statements about fac–mer isomerism.
Statement I: It is commonly shown by octahedral complexes of the type .
Statement II: In the fac form, the three identical ligands are mutually cis.
Statement III: In the mer form, one pair of identical ligands is trans.
Statement IV: The coordination number changes between the fac and mer forms.
The valid statements are:

a) I, II, III and IV

b) II and IV only

c) I and IV only

d) I, II and III

16 / 50

16. Match each cobalt compound in Column I with the number of chloride ions precipitated immediately by excess per formula unit.

Column I	Column II
P.	1. Zero
Q.	2. One
R.	3. Two
S.	4. Three

a) P-3, Q-4, R-1, S-2

b) P-1, Q-2, R-3, S-4

c) P-4, Q-3, R-2, S-1

d) P-4, Q-2, R-3, S-1

17 / 50

17. Which formula represents tetraammineaquachloridocobalt(III) chloride?

18 / 50

18. Assertion: donation and back-bonding in a metal carbonyl reinforce one another.
Reason: donation increases electron density at the metal for back donation, while back donation removes some metal electron density and allows continued ligand-to-metal donation.

a) Both Assertion and Reason are true, and Reason explains Assertion

b) Assertion is false, but Reason is true

c) Assertion is true, but Reason is false

d) Both Assertion and Reason are true, but Reason does not explain Assertion

19 / 50

19. Consider the following statements about optical isomers.
Statement I: They have the same metal–ligand connectivity.
Statement II: They are non-superimposable mirror images.
Statement III: They necessarily have different oxidation states.
Statement IV: They may rotate plane-polarised light in opposite directions.
The valid statements are:

a) II and III only

b) I, II and IV only

c) I, II, III and IV

d) I and III only

20 / 50

20. Two ligands, and , each attach to a metal through one donor atom. The comparison demonstrates that:

a) donor-atom count is obtained from the numerical value of ligand charge

b) ligand charge and number of donor atoms are independent properties

c) neutral ligands always contain fewer atoms than anionic ligands

d) an anionic ligand necessarily forms more coordinate bonds than a neutral ligand

21 / 50

21. A coordination entity and its mirror image are found to overlap completely after suitable rotation. The entity is:

a) necessarily a linkage isomer

b) achiral

c) one member of an enantiomeric pair

d) optically active

22 / 50

22. Match each description in Column I with the appropriate designation in Column II.

Column I	Column II
P. Right-handed tris-chelate helix	1. Achiral
Q. Left-handed tris-chelate helix	2.
R. Mirror images that cannot overlap	3. Enantiomers
S. Mirror image superimposable on the original	4.

a) P-3, Q-1, R-4, S-2

b) P-2, Q-3, R-1, S-4

c) P-4, Q-2, R-1, S-3

d) P-2, Q-4, R-3, S-1

23 / 50

23. A metal ion is initially surrounded by six separate monodentate ligands. They are replaced by one ligand, and all six donor atoms of bind to the metal. The replacement changes:

a) neither ligand count nor coordination number

b) the coordination number from to

c) ligand count , while coordination number stays

d) both ligand count and coordination number from to

24 / 50

24. Complex absorbs at , while complex absorbs at . The ratio is:

25 / 50

25. An analyst adds a ligand that forms a stable soluble complex with an interfering metal ion . The target ion is then precipitated without precipitation of . The role of is best described as:

a) oxidising the target ion

b) acting as a masking agent for

c) increasing the free concentration of

d) converting the precipitating reagent into a metal

26 / 50

26. A six-coordinate complex contains a metal ion. Strong ligand-induced pairing leaves two inner orbitals vacant. Which set of properties is predicted by the standard valence bond treatment?

a) , octahedral, and unpaired electrons

b) , tetrahedral, and unpaired electrons

c) , square planar, and unpaired electrons

d) , octahedral, and unpaired electrons

27 / 50

27. A metal complex is converted completely into . If of reacts according to

the total moles of free released and consumed are respectively:

a) and

b) and

c) and

d) and

28 / 50

28. Consider the following statements about naming the central metal.
Statement I: A metal in a neutral coordination entity retains its ordinary name.
Statement II: A metal in a complex cation retains its ordinary name.
Statement III: A metal in every complex anion also retains its ordinary name without modification.
The valid statements are:

a) II and III only

b) I and II only

c) I only

d) I and III only

29 / 50

29. The tetrahedral crystal-field configuration of in is:

30 / 50

30. For low-spin , the VBT and CFT descriptions, respectively, are:

a) VBT: ; CFT:

b) VBT: ; CFT:

c) VBT: ; CFT:

d) VBT: ; CFT:

31 / 50

31. Match each description in Column I with the appropriate classification in Column II.

Column I	Column II
P. One joins two metal ions	1. Terminal monodentate
Q. One binds one metal through two nitrogen atoms	2. Bridging
R. One binds one metal through nitrogen	3. Chelating
S. One connects two metal atoms	4. Bridging carbonyl

a) P-2, Q-4, R-1, S-3

b) P-2, Q-3, R-1, S-4

c) P-3, Q-2, R-4, S-1

d) P-4, Q-1, R-3, S-2

32 / 50

32. Cisplatin and transplatin have the same formula, , but differ in:

a) the relative ammine and chlorido positions

b) the donor atoms used by ammonia

c) the number of ligands attached to platinum

d) the oxidation state of platinum

33 / 50

33. A target ligand forms a stable complex , but a second ligand is added and binds the same metal even more strongly. What may happen to the concentration of ?

a) It must increase because every added ligand favours every metal complex equally

b) It may fall because competes for the metal

c) It must remain unchanged because the intrinsic formula of has not changed

d) It becomes independent of all equilibrium constants

34 / 50

34. A student claims that a complex cannot absorb electromagnetic radiation because all its orbitals are filled. Which correction is best?

a) Its filled shell prevents every possible type of electronic transition

b) Ordinary - absorption is absent; charge-transfer absorption may remain

c) A ion automatically changes into during coordination

d) A complex always has five unpaired electrons

35 / 50

35. Study the descriptions of the crystal field model.

Row	Feature	Description
P	Free metal ion	Five degenerate orbitals
Q	Ligand approach	Produces directional electrostatic repulsion
R	Crystal field splitting	Removes -orbital degeneracy
S	Barycentre	Moves upward by the full splitting energy

The inconsistent row is:

a) S

b) Q

c) R

d) P

36 / 50

36. Multiplying the equilibria

and

gives which overall equilibrium and constant relation?

a) and

b) and

c) and

d) and

37 / 50

37. Use the arrangement described below.
A filled orbital on the carbon end of points directly toward an empty metal orbital along the metal–carbon axis.
Which bond is primarily formed by this overlap?

a) A carbon–oxygen ionic bond

b) A metal–carbon bond

c) A ligand–ligand bond

d) A metal–oxygen bond

38 / 50

38. Assertion: Oxidation of the central metal ion can change the colour of a coordination compound even when its ligands and geometry remain unchanged.
Reason: Oxidation can change both the metal -electron count and the magnitude of crystal-field splitting.

a) Both Assertion and Reason are true, but Reason does not explain Assertion

b) Both Assertion and Reason are true, and Reason explains Assertion

c) Assertion is true, but Reason is false

d) Assertion is false, but Reason is true

39 / 50

39. Use the two arrangements described below.
Case 1: One ligand is bonded to two metal centres.
Case 2: One ligand uses both nitrogen atoms to bind the same metal centre.
The ligand roles in Case 1 and Case 2 are respectively:

a) chelating and bridging

b) bidentate and terminal

c) ambidentate and monodentate

d) bridging and chelating

40 / 50

40. Assertion: Simple valence bond theory can predict that two complexes have different numbers of unpaired electrons but may not explain the energetic origin of that difference.
Reason: The theory assigns pairing and hybridisation without quantitatively comparing orbital splitting energy with pairing energy.

a) Assertion is true, but Reason is false

b) Both Assertion and Reason are true, and Reason explains Assertion

c) Assertion is false, but Reason is true

d) Both Assertion and Reason are true, but Reason does not explain Assertion

41 / 50

41. Which octahedral configuration does not have distinct high-spin and low-spin arrangements?

42 / 50

42. Which sequence is arranged from weaker field to stronger field in the spectrochemical series?

43 / 50

43. A tetrahedral high-spin ion has which CFSE and unpaired-electron count?

a) and three unpaired electrons

b) and five unpaired electrons

c) and five unpaired electrons

d) and one unpaired electron

44 / 50

44. Study the ligand-name table.

Row	Ligand	Proposed ligand name
P		Ammine
Q		Aqua
R		Cyanide
S		Carbonyl

The inconsistent row is:

a) Q

b) S

c) R

d) P

45 / 50

45. Assertion: A complex with a larger spin-only magnetic moment generally contains more unpaired electrons.
Reason: The quantity increases as the allowed integral value of increases.

a) Both Assertion and Reason are true, and Reason explains Assertion

b) Assertion is false, but Reason is true

c) Both Assertion and Reason are true, but Reason does not explain Assertion

d) Assertion is true, but Reason is false

46 / 50

46. For the equilibrium

which expression represents ?

47 / 50

47. In , the metal has oxidation state . The values of and the coordination number are:

a) and coordination number

b) and coordination number

c) and coordination number

d) and coordination number

48 / 50

48. Assertion: Formation of can cause solid to dissolve.
Reason: Complex formation lowers the concentration of free , shifting the dissolution equilibrium of toward the ions.

a) Both Assertion and Reason are true, but Reason does not explain Assertion

b) Assertion is true, but Reason is false

c) Both Assertion and Reason are true, and Reason explains Assertion

d) Assertion is false, but Reason is true

49 / 50

49. The stepwise constants for formation of are , , and . The value of is:

50 / 50

50. In , the oxidation state and -electron configuration of cobalt are respectively:

a) and

b) and

c) and

d) and

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Coordination Compounds Mock Test – Class 12 Chemistry

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