Coordination Compounds Mock Test

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Quiz: Coordination Compounds – Progressive Test
Total questions: 582
Questions in this round: 50
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Quiz: Coordination Compounds – Certificate Challenge
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Coordination Compounds – Progressive Test

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1 / 50

1. A student assigns square-planar geometry and diamagnetism to , reasoning that every diamagnetic four-coordinate nickel compound must be square planar. The assignment should be evaluated as follows:

a) is diamagnetic, tetrahedral, and

b) The assignment is wrong because is paramagnetic and octahedral

c) The assignment is correct because every complex is square planar

d) The assignment is correct because magnetic behaviour uniquely fixes geometry

2 / 50

2. Study the isomer classifications.

Row	Structural change	Proposed classification
P	Ligands exchange between a complex cation and a complex anion	Coordination isomerism
Q	A coordinated bromido ligand exchanges with a sulfate counter ion	Ionisation isomerism
R	An ambidentate ligand changes its donor atom	Linkage isomerism
S	Water moves between the coordination sphere and crystal lattice	Coordination isomerism

The inconsistent row is:

a) Q

b) S

c) R

d) P

3 / 50

3. Study the expected qualitative-test results.

Row	Compound	Reagent	Expected observation
P			precipitate
Q			precipitate
R			from free bromide
S			No immediate sulfate precipitate

The inconsistent row is:

a) Q

b) R

c) P

d) S

4 / 50

4. Complex is , whereas complex is . The comparison between them is:

a) The ligands are neutral in but negatively charged in

b) is polynuclear and is mononuclear

c) is mononuclear, polynuclear; iron is in both

d) Iron is in and in

5 / 50

5. Compare the total crystal-field and pairing contributions for octahedral , counting for each paired orbital. The high-spin and low-spin expressions are respectively:

a) and

b) and

c) and

d) and

6 / 50

6. Carbon monoxide contains both carbon and oxygen, yet a terminal ligand is normally classified as monodentate because:

a) oxygen is removed before coordination occurs

b) only one atom of the ligand can possess electrons

c) carbon monoxide becomes a monatomic ion on bonding

d) one carbonyl donor atom binds the metal

7 / 50

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

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

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

c) neutral ligands always contain fewer atoms than anionic ligands

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

8 / 50

8. Cisplatin is represented by the formula:

a) cis-

c) trans-

9 / 50

9. Assertion: Ionisation isomers can give different precipitates with suitable reagents.
Reason: The identity of the ion released from outside the coordination sphere differs between the isomers.

a) Assertion is true, but Reason is false

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

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

d) Assertion is false, but Reason is true

10 / 50

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

a) and

b) and

c) and

d) and

11 / 50

11. Study the charge-balance table.

Compound	Coordination-entity charge	Counter ions per formula unit
P.		Three
Q.		Four
R.		One
S.		Two

The inconsistent row is:

a) Q

b) S

c) R

d) P

12 / 50

12. Assertion: and can possess the same coordination polyhedron.
Reason: Both entities can place six donor atoms at the vertices of an octahedron, although they contain different numbers of ligand molecules.

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

13 / 50

13. Assertion: A large overall formation constant generally indicates that a complex is thermodynamically stable under the stated conditions.
Reason: A large means that the equilibrium strongly favours the complex relative to free and .

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

b) Assertion is false, but Reason is true

c) Assertion is true, but Reason is false

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

14 / 50

14. The meridional form of an octahedral complex contains:

a) three ligands that are all mutually cis

b) three ligands occupying a single triangular face

c) one trans -pair and a third cis to both

d) three ligands that are all mutually trans

15 / 50

15. A bidentate ligand differs from two separate monodentate ligands because a bidentate ligand:

a) always forms two separate coordination entities

b) can coordinate only to metals having oxidation state

c) must carry a charge of

d) binds one metal through two donor atoms of one ligand

16 / 50

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

a) optically active

b) achiral

c) one member of an enantiomeric pair

d) necessarily a linkage isomer

17 / 50

17. Two complexes contain the same transition metal in oxidation state . Complex is observed to be paramagnetic and tetrahedral, whereas complex is diamagnetic and square planar. The strongest conclusion from these observations is:

a) the central metal must have different atomic numbers in the two complexes

b) the oxidation state alone uniquely determines geometry and magnetism

c) ligands influence orbital use and pairing at the same metal oxidation state

d) counter-ion charge changes the number of protons in the metal nucleus

18 / 50

18. In a tetrahedral crystal field, the lower and upper -orbital sets are respectively:

a) and

b) and

c) and

d) and

19 / 50

19. Two coordination entities contain the same metal in the same oxidation state but have different ligands. They may still differ in geometry and magnetic behaviour because:

a) the oxidation state must secretly change when the ligands change

b) counter ions alone determine the orbital arrangement of the metal

c) the number of electrons becomes unrelated to the central metal

d) ligands can alter orbital energies and electron pairing

20 / 50

20. Complex contains six monodentate ligands, complex contains three bidentate ligands, and complex contains two tridentate ligands. If all donor sites are coordinated, the three complexes:

a) have coordination numbers , , and , respectively

b) must have identical charges and oxidation states

c) have equal ligand counts but different coordination numbers

d) ligand counts , , ; coordination number throughout

21 / 50

21. The formula of potassium tris(oxalato)ferrate(III) is:

22 / 50

22. 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

23 / 50

23. Three cobalt(III) complexes are compared under the standard valence bond model:
Case P:
Case Q:
Case R:
The correct magnetic classification is:

a) P, Q, and R are all diamagnetic

b) P and R are paramagnetic, while Q is diamagnetic

c) P is paramagnetic, while Q and R are diamagnetic

d) P and Q are diamagnetic, while R is paramagnetic

24 / 50

24. A graph has metal electron density on the horizontal axis and extent of back-bonding to identical ligands on the vertical axis. Which general trend is expected?

a) A sudden fall to zero as soon as the metal reaches oxidation state

b) Back-bonding generally rises with metal electron density

c) A decreasing trend because electron-rich metals cannot donate to ligands

d) A horizontal line because back-bonding is independent of the metal

25 / 50

25. Consider the following statements about square-planar geometrical isomerism.
Statement I: Square-planar can form cis and trans isomers.
Statement II: Square-planar has only one geometrical arrangement.
Statement III: Cis and trans forms differ in the oxidation state of the central metal.
Statement IV: A rigid rotation of the whole complex does not convert cis into trans.
The valid statements are:

a) II and III only

b) I, II, III and IV

c) I and III only

d) I, II and IV only

26 / 50

26. A learner names as “chloride hexaamminecobalt(III).” The principal error is that:

a) the oxidation state should be written before cobalt

b) the anion has been named before the complex cation

c) chloride should be included among the six coordinated ligands

d) ammonia should be treated as an external counter ion

27 / 50

27. Consider the following statements about a coordination sphere.
Statement I: It includes the central metal and all ligands directly attached to it.
Statement II: It may be neutral, positively charged, or negatively charged.
Statement III: Every counter ion required for electrical neutrality must be written inside the square brackets.
The valid statements are:

a) I only

b) II and III only

c) I, II and III

d) I and II only

28 / 50

28. Complexes and contain the same metal ion in the same oxidation state and have the same geometry. The ligand in produces a stronger field than the ligand in . Which conclusion is most reasonable?

a) Complex must contain fewer ligands

b) Their colours must be identical because their -electron counts are identical

c) P and Q may have different colours because their splitting energies differ

d) The metal in must have a different atomic number

29 / 50

29. Study the classification table.

Coordination entity	Proposed classification
P.	Neutral complex
Q.	Complex cation
R.	Complex anion
S.	Complex cation

The classifications that are supported are:

a) P, Q, R and S

b) P, Q and R

c) P and S only

d) Q and S only

30 / 50

30. Use the supplied complementary-colour table.

Predominantly absorbed colour	Observed complementary colour
Blue	Orange
Green	Red
Yellow	Violet

A complex that appears red predominantly absorbs:

a) Yellow light

b) Red light

c) Blue light

d) Green light

31 / 50

31. Study the comparison of the two bonding models.

Row	Feature	Model used more directly
P	Assignment of hybridisation	VBT
Q	Calculation of octahedral CFSE	CFT
R	Explanation of high-spin versus low-spin states through and	CFT
S	Complete quantitative description of metal–ligand covalency	VBT

The inconsistent row is:

a) S

b) Q

c) P

d) R

32 / 50

32. Assertion: Primary valency is generally ionisable in Werner’s theory.
Reason: Secondary valencies are directed toward fixed positions in space.

a) Reason alone is true; Assertion is false

b) Assertion alone is true; Reason is false

c) Both are true; Reason explains Assertion

d) Both are true; Reason is not the explanation

33 / 50

33. Which formula can act as the coordination isomer of ?

34 / 50

34. Two complexes are compared. Complex contains only neutral ligands around a metal in oxidation state . Complex contains the same metal oxidation state but has one replaced by one . Relative to , complex has:

a) a charge lower by one unit

b) the same charge because both ligands donate lone pairs

c) an oxidation state lower by one unit

d) a charge greater by one unit

35 / 50

35. Ligands and are monodentate and coordinate through the same type of donor atom. Ligand is the stronger base under the stated conditions. Which tendency is commonly expected?

a) Basicity determines substitution rate but can never influence thermodynamic stability

b) may form the more stable complex by donating electron density more effectively

c) must form the more stable complex because weaker bases always bind more strongly

d) Both ligands must have identical formation constants

36 / 50

36. Study the ligand-effect descriptions.

Row	Condition	Likely consequence in a suitable octahedral complex
P	Strong-field ligand	Pairing may increase
Q	Weak-field ligand	More unpaired electrons may remain
R	Two vacant inner orbitals available	may form
S	Inner electrons remain maximally unpaired	Diamagnetism is guaranteed

The inconsistent row is:

a) Q

b) S

c) R

d) P

37 / 50

37. A sample of is treated with excess . If , the mass of formed is:

38 / 50

38. Cis- and trans- contain cobalt in the same oxidation state because:

a) only the counter ions determine the metal oxidation state

b) the trans isomer contains fewer ligands than the cis isomer

c) ligand counts, charges, and complex charge remain unchanged

d) geometrical isomerism changes the charge of each chlorido ligand

39 / 50

39. When the five orbitals split in an ideal ligand field, their weighted average energy remains at the ______.

a) ionisation limit

b) pairing-energy level

c) barycentre

d) ligand ground state

40 / 50

40. For an octahedral complex, . The energy positions of the and levels relative to the barycentre are respectively:

a) and

b) and

c) and

d) and

41 / 50

41. Paired and high-spin octahedral arrangements differ as follows:

a) Both forms have four unpaired electrons

b) Both forms are necessarily diamagnetic

c) The paired form has no unpaired electrons, while the high-spin form has two

d) The paired form has two unpaired electrons and the high-spin form four

42 / 50

42. Study the optical-isomerism table.

Row	Observation	Conclusion
P	Mirror images are non-superimposable	Chiral pair possible
Q	A plane of symmetry is present	Entity is ordinarily achiral
R	Mirror image overlaps after rotation	Same achiral structure
S	Enantiomers have different molecular formulas	Optical isomerism confirmed

The inconsistent row is:

a) S

b) Q

c) R

d) P

43 / 50

43. For the equilibrium

which expression represents ?

44 / 50

44. In the ligand-name segment for , the missing multiplicative prefix in “______aquachlorido” is:

a) penta-

b) hexa-

c) tetra-

d) tri-

45 / 50

45. 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

46 / 50

46. For , the oxidation state of chromium, charge on the coordination entity, and coordination number are respectively:

a) , , and

b) , , and

c) , , and

d) , , and

47 / 50

47. For high-spin octahedral , the CFSE and magnetic moment are:

a) and

b) and

c) and

d) and

48 / 50

48. Which orbitals constitute the upper set in a tetrahedral field?

a) , , and

b) , , and

c) and

d) and

49 / 50

49. A cobalt complex is octahedral and contains . Magnetic measurement shows four unpaired electrons. The most consistent ligand and hybridisation combination is:

a) with diamagnetic

b) with

c) with paired

d) with

50 / 50

50. Assertion: A octahedral complex is called an inner-orbital complex.
Reason: The two orbitals used in hybridisation belong to the shell.

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

b) Assertion is false, but Reason is true

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

d) Assertion is true, but Reason is false

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Coordination Compounds Mock Test – Class 12 Chemistry

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