Coordination Compounds Online Mock Test: NEET PYQ

1. Ethylene diaminetetraacetate ion is a/an:

2. Which of the following is not an ambidentate ligand? [NEET 2024 Re]

3.

[Mn₂(CO)₁₀] and [Co₂(CO)₈] structures have:
A. Metal–Metal linkage
B. Terminal CO groups
C. Bridging CO groups
D. Metal in zero oxidation state

Choose the correct answer from the options given below: [NEET 2024 Re]

4. Match List I with List II. [NEET 2024]

Choose the correct answer from the options given below:

5.

Given below are two statements: [NEET 2024]
Statement I: Both [Co(NH₃)₆]³⁺ and [CoF₆]³⁻ complexes are octahedral but differ in their magnetic behaviour.
Statement II: [Co(NH₃)₆]³⁺ is diamagnetic whereas [CoF₆]³⁻ is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below:

6. Given below are two statements: [NEET 2024]
Statement I: [Co(NH₃)₆]³⁺ is a homoleptic complex whereas [Co(NH₃)₄Cl₂]⁺ is a heteroleptic complex.
Statement II: Complex [Co(NH₃)₆]³⁺ has only one kind of ligand but [Co(NH₃)₄Cl₂]⁺ has more than one kind of ligands.
In the light of the above statements, choose the correct answer from the options given below:

7. Homoleptic complex from the following complexes is: [NEET 2023]

8. Homoleptic complex from the following complexes is: [NEET 2023]

9. Select the element (M) whose trihalides cannot be hydrolysed to produce an ion of the form [M(H₂O)₆]³⁺ [NEET 2023 mpr]

10. Which of the following forms a set of complex and a double salt, respectively? [NEET 2023 mpr]

11. Type of isomerism exhibited by compounds
[Cr(H₂O)₆]Cl₃, [Cr(H₂O)₅Cl]Cl₂·H₂O, [Cr(H₂O)₄Cl₂]Cl·2H₂O and the value of coordination number (CN) of central metal ion in all these compounds, respectively is: [NEET 2023 mpr]

12. The IUPAC name of the complex [Ag(H₂O)₂][Ag(CN)₂] is: [NEET 2022]

13. The [High to Low] order of energy absorbed which is responsible for the color of complexes [NEET 2022]
(A) [Ni(H₂O)₂(en)₂]²⁺
(B) [Ni(H₂O)₄(en)]²⁺
(C) [Ni(en)₃]²⁺ is:

14. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). [NEET Re-2022]
Assertion (A): The metal-carbon bond in metal carbonyls possesses both σ and π character.
Reason (R): The ligand to metal bond is a π bond and metal to ligand bond is a σ bond.
In the light of the above statements, choose the most appropriate answer from the options given below:

15. Ethylene diamine tetraacetate (EDTA) ion is: [NEET 2021]

1. Which of the following is the correct order of increasing field strength of ligands to form coordination compounds? (2020)

2. The calculated spin only magnetic moment of Cr²⁺ ion is: (2020)

3. What is the correct electronic configuration of the central atom in K₄[Fe(CN)₆] based on crystal field theory? (NEET 2019)

4. Aluminium chloride in acidified aqueous solution forms a complex 'A', in which hybridisation state of Al is 'B'. What are 'A' and 'B', respectively?

5. The crystal field stabilisation energy (CFSE) for [CoCl₆]⁴⁻ is 18000 cm⁻¹. The CFSE for [CoCl₄]²⁻ will be:

6. The type of isomerism shown by the complex [CoCl₂(en)₂] is:

7. The geometry and magnetic behaviour of the complex [Ni(CO)₄] are:

8. Iron carbonyl, Fe(CO)₅ is:

9. An example of a sigma bonded organometallic compound is:

10. The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes CoCl₃·6NH₃, CoCl₃·5NH₃, CoCl₃·4NH₃ respectively is: (NEET 2017)

11. Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is: (NEET 2017)

12. Pick out the correct statement with respect to [Mn(CN)₆]³⁻ (NEET 2017)

13. The correct increasing order of trans-effect of the following species is: (NEET-II 2016)

14. Jahn-Teller effect is not observed in high spin complexes of: (NEET-II 2016) (WB SLST 2025, PG)

15. Which of the following has longest C–O bond length? (Free C–O bond length in CO is 1.128 Å) (NEET-I 2016)

16. Which of the following has longest C–O bond length? (Free C–O bond length in CO is 1.128 Å) (NEET-I 2016)

1. Of the following complex ions, which is diamagnetic in nature? 2011

2. The complexes [Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)₆][Co(CN)₆] are the examples of which type of isomerism? (2011)

3. The complex [Pt(Py)(NH₃)BrCl] will have how many geometrical isomers? (2011)

4. The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (2011)

5. Which of the following carbonyls will have the strongest C−O bond? (2011 Mains)

6. Which of the following complex compounds will exhibit highest paramagnetic behaviour?
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30) (2011 Mains)

7. Which of the following complex ions is not expected to absorb visible light? (2010)

8. Crystal field stabilization energy for high spin d⁵ octahedral complex is (2010)

9. The existence of two different coloured complexes with the composition [Co(NH₃)₄Cl₂] is due to (2010)

10. Which one of the following complexes is not expected to exhibit isomerism? 2010

11. Out of TiF₆²⁻, CoF₆³⁻, CuCl₂ and NiCl₄²⁻ the colourless species are
(Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) (NEET 2009)

12. Which of the following does not show optical isomerism?
(en = ethylenediamine) (2009)

13. Which of the following complex ions is expected to absorb visible light?
(At. no. Zn = 30, Sc = 21, Ti = 22, Cr = 24) (2009)

14. Which of the following complexes exhibits the highest paramagnetic behaviour?
(Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties)
(At number Ti = 22, V = 23, Fe = 26, Co = 27) (2008)

15. In which of the following coordination entities the magnitude of Δ₀ (CFSE in octahedral field) will be maximum?
(At. No. Co = 27) (NEET 2008)

Ethylene diaminetetraacetate ion is a/an:

Which of the following is not an ambidentate ligand? [NEET 2024 Re]

[Mn₂(CO)₁₀] and [Co₂(CO)₈] structures have:
A. Metal–Metal linkage
B. Terminal CO groups
C. Bridging CO groups
D. Metal in zero oxidation state

Choose the correct answer from the options given below: [NEET 2024 Re]

Match List I with List II. [NEET 2024]

Choose the correct answer from the options given below:

Given below are two statements: [NEET 2024]
Statement I: Both [Co(NH₃)₆]³⁺ and [CoF₆]³⁻ complexes are octahedral but differ in their magnetic behaviour.
Statement II: [Co(NH₃)₆]³⁺ is diamagnetic whereas [CoF₆]³⁻ is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: [NEET 2024]
Statement I: [Co(NH₃)₆]³⁺ is a homoleptic complex whereas [Co(NH₃)₄Cl₂]⁺ is a heteroleptic complex.
Statement II: Complex [Co(NH₃)₆]³⁺ has only one kind of ligand but [Co(NH₃)₄Cl₂]⁺ has more than one kind of ligands.
In the light of the above statements, choose the correct answer from the options given below:

Homoleptic complex from the following complexes is: [NEET 2023]

Homoleptic complex from the following complexes is: [NEET 2023]

Select the element (M) whose trihalides cannot be hydrolysed to produce an ion of the form [M(H₂O)₆]³⁺ [NEET 2023 mpr]

Which of the following forms a set of complex and a double salt, respectively? [NEET 2023 mpr]

Type of isomerism exhibited by compounds
[Cr(H₂O)₆]Cl₃, [Cr(H₂O)₅Cl]Cl₂·H₂O, [Cr(H₂O)₄Cl₂]Cl·2H₂O and the value of coordination number (CN) of central metal ion in all these compounds, respectively is: [NEET 2023 mpr]

The IUPAC name of the complex [Ag(H₂O)₂][Ag(CN)₂] is: [NEET 2022]

The [High to Low] order of energy absorbed which is responsible for the color of complexes [NEET 2022]
(A) [Ni(H₂O)₂(en)₂]²⁺
(B) [Ni(H₂O)₄(en)]²⁺
(C) [Ni(en)₃]²⁺ is:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). [NEET Re-2022]
Assertion (A): The metal-carbon bond in metal carbonyls possesses both σ and π character.
Reason (R): The ligand to metal bond is a π bond and metal to ligand bond is a σ bond.
In the light of the above statements, choose the most appropriate answer from the options given below:

Ethylene diamine tetraacetate (EDTA) ion is: [NEET 2021]

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds? (2020)

The calculated spin only magnetic moment of Cr²⁺ ion is: (2020)

What is the correct electronic configuration of the central atom in K₄[Fe(CN)₆] based on crystal field theory? (NEET 2019)

Aluminium chloride in acidified aqueous solution forms a complex 'A', in which hybridisation state of Al is 'B'. What are 'A' and 'B', respectively?

The crystal field stabilisation energy (CFSE) for [CoCl₆]⁴⁻ is 18000 cm⁻¹. The CFSE for [CoCl₄]²⁻ will be:

The type of isomerism shown by the complex [CoCl₂(en)₂] is:

The geometry and magnetic behaviour of the complex [Ni(CO)₄] are:

Iron carbonyl, Fe(CO)₅ is:

An example of a sigma bonded organometallic compound is:

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes CoCl₃·6NH₃, CoCl₃·5NH₃, CoCl₃·4NH₃ respectively is: (NEET 2017)

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is: (NEET 2017)

Pick out the correct statement with respect to [Mn(CN)₆]³⁻ (NEET 2017)

The correct increasing order of trans-effect of the following species is: (NEET-II 2016)

Jahn-Teller effect is not observed in high spin complexes of: (NEET-II 2016) (WB SLST 2025, PG)

Which of the following has longest C–O bond length? (Free C–O bond length in CO is 1.128 Å) (NEET-I 2016)

The hybridization involved in complex [Ni(CN)₄]²⁻ is (At. No. Ni = 28) (2015)

Which of the following has longest C–O bond length? (Free C–O bond length in CO is 1.128 Å) (NEET-I 2016)

The hybridization involved in complex [Ni(CN)₄]²⁻ is (At. No. Ni = 28) (2015)

The name of complex ion, [Fe(CN)₆]³⁻ is:

The sum of coordination number and oxidation number of metal M in the complex [M(en)₂(C₂O₄)]Cl (where en is ethylenediamine) is:

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be:

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C?

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is:

Which of the following complexes is used as an anticancer agent?

A magnetic moment at 1.73 BM will be shown by one among the following

The anion of acetylacetone (acac) forms Co(acac)₃ chelate with Co³⁺. The rings of the chelate are: (Karnataka NEET 2013)

The correct IUPAC name for [CrF₂(en)₂]Cl is (Karnataka NEET 2013)

Which among the following is a paramagnetic complex?
(At. No. Mo = 42, Pt = 78)
(Karnataka NEET 2013)

Which is diamagnetic? (Karnataka NEET 2013)

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour? (2012)

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true? (2012 Mains)

Low spin complex of d⁶ cation in an octahedral field will have the following energy (Δ₀ = crystal field splitting energy in an octahedral field, P = Electron pairing energy) (2012 Mains)

Of the following complex ions, which is diamagnetic in nature? 2011

The complexes [Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)₆][Co(CN)₆] are the examples of which type of isomerism? (2011)

The complex [Pt(Py)(NH₃)BrCl] will have how many geometrical isomers? (2011)

The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (2011)

Which of the following carbonyls will have the strongest C−O bond? (2011 Mains)

Which of the following complex compounds will exhibit highest paramagnetic behaviour?
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30) (2011 Mains)

Which of the following complex ions is not expected to absorb visible light? (2010)

Crystal field stabilization energy for high spin d⁵ octahedral complex is (2010)

The existence of two different coloured complexes with the composition [Co(NH₃)₄Cl₂] is due to (2010)

Which one of the following complexes is not expected to exhibit isomerism? 2010

Out of TiF₆²⁻, CoF₆³⁻, CuCl₂ and NiCl₄²⁻ the colourless species are
(Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) (NEET 2009)

Which of the following does not show optical isomerism?
(en = ethylenediamine) (2009)

Which of the following complex ions is expected to absorb visible light?
(At. no. Zn = 30, Sc = 21, Ti = 22, Cr = 24) (2009)

Which of the following complexes exhibits the highest paramagnetic behaviour?
(Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties)
(At number Ti = 22, V = 23, Fe = 26, Co = 27) (2008)

In which of the following coordination entities the magnitude of Δ₀ (CFSE in octahedral field) will be maximum?
(At. No. Co = 27) (NEET 2008)

Which of the following will give a pair of enantiomorphs?
(en = NH₂CH₂CH₂NH₂) (NEET 2007)

The d electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Ni²⁺ are 3d⁴, 3d⁵, 3d⁶ and 3d⁸ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28) (AIPMT 2007)

[Cr(H₂O)₆]Cl₃ (At. no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is (AIPMT 2006)

[Co(NH₃)₄(NO₂)₂]Cl exhibits (AIPMT 2006)