Given below are two statements : 
Statement I:  \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\) is a homoleptic complex, whereas \([Co(NH_3)_4 Cl_2]^+\) is a heteroleptic complex.
Statement II: Complex \([Co(NH_3)_6]^{3+}\) has only one kind of ligand but \([Co(NH_3)_4 Cl_2]^+\) has more than one kind of ligands. 
In light of the above statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are False.
2. Statement I is True but Statement II is False.
3. Statement I is false but Statement II is True.
4. Both Statement I and Statement II are True.
Subtopic:  Introduction, Classification and Nomenclature |
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Match the complex ions in List-I with their corresponding hybridization in List-II.
List -I
(Complex ion)
List -II
(Hybridisation)
A.  \([\mathrm{Ni}(\mathrm{CN})_4]^{2-}\) I.  \(s p^3 \)
B.  \(\mathrm{[CoF_6}]^{3-}\) II.  \( d^2sp^3 \)
C.  \([\mathrm{Co}(\mathrm{C}_2 \mathrm{O}_4)_3 ]^{3-}\) III.  \(s p^3d^2\)
D.  \(\mathrm{[NiCl_4}]^{2-}\) IV.  \(dsp^2\)

Choose the correct answer from the options given below:
1. A-IV, B-III, C-II, D-I
2. A-III, B-I, C-IV, D-II
3. A-I, B-II, C-III, D-IV
4. A-III, B-IV, C-II, D-I
Subtopic:  VBT, CFT & their Limitations |
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Match the complexes from List-I with their corresponding type of isomerism from List-II:
List-I (Complex) List-II (Type of isomerism)
A. \(\mathrm{\left[{Co}\left({NH}_3\right)_5\left({NO}_2\right)\right] {Cl}_2}\) I. Solvate isomerism
B. \(\mathrm{\left[{Co}\left({NH}_3\right)_5\left({SO}_4\right)\right] {Br}}\) II. Linkage isomerism
C. \(\mathrm{\left[{Co}\left({NH}_3\right)_6\right]\left[{Cr}({CN})_6\right]}\) III. Ionization isomerism
D. \(\mathrm{\left[{Co}\left({H}_2 {O}\right)_6\right] {Cl}_3}\) IV. Coordination isomerism

Choose the correct from the options given below:

1. A-I, B-III, C-IV, D-II
2. A-I, B-IV, C-III, D-II
3. A-II, B-IV, C-III, D-I
4. A-II, B-III, C-IV, D-I
Subtopic:  Isomerism in Coordination Compounds |
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Given below are two statements :
Statement I : Both \(\left[\text{Co}\left(\text{NH}_3\right)_6\right]^{3+}\) and \(\left[\text{CoF}_6\right]^{3-}\) Complexes are octahedral but differ in their magnetic behaviour.
Statement II : \(\left[\text{Co}\left(\text{NH}_3\right)_6\right]^{3+}\) is diamagnetic whereas \(\left[\text{CoF}_6\right]^{3-}\) is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are False.
2. Statement I is True and Statement II is False.
3. Statement I is False but Statement II is True.
4. Both Statement I and Statement II are True.
Subtopic:  VBT, CFT & their Limitations |
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The correct 'spin only' magnetic moments of \([\text{CoF}_6]^{3-}\) and \(\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}\) respectively, are:
1. 0 BM and 4.9 BM
2. 0 BM and 0 BM
3. 4.9 BM and 0 BM
4. 4.9 BM and 4.9 BM
Subtopic:  VBT, CFT & their Limitations |
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The crystal field stabilisation energy (CFSE) and the 'spin only' magnetic moment of \(\mathrm{[FeF_6]^{3-}}\) ion respectively, are:

1. \(0~\Delta~\text{and}~5.9~\text{BM}\)
2. \(0~\Delta~\text{and}~1.73~\text{BM}\)
3. \(2.0~\Delta~\text{and}~5.9~\text{BM}\)
4. \(2.0~\Delta~\text{and}~1.73~\text{BM}\)
Subtopic:  VBT, CFT & their Limitations |
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Match List-I with List-II 
List-I List-II
A. Haber process I. Fe catalyst
B. Wacker oxidation II. \(PdCl_2\)
C. Wilkinson catalyst III. \([PPh_3)_3 RhCl]\)
D. Ziegler catalyst IV. \(TiCl_4~ \text {with}~ Al(CH_3)_3\)
Choose the correct answer from the options given below:
1. A-I, B-II, C-III, D-IV
2. A-I, B-IV, C-III, P-II
3. A-I, B-II, C-IV, D-III
4. A-II, B-III, C-I, D-IV
Subtopic:  Organometallic Complexes & their Uses |
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Level 3: 35%-60%
NEET - 2025
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The correct order of the wavelength of light absorbed by the following complexes is. 
A. \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+} \) B. \(\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} \)
C. \(\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+} \) D. \(\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\)

Choose the correct answer from the options given below: 
1. \(C<D<A<B\)
2. \(C<A<D<B\)
3. \(B<D<A<C\)
4. \(B<A<D<C\)
Subtopic:  VBT, CFT & their Limitations |
 52%
Level 3: 35%-60%
NEET - 2025
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Which of the following are paramagnetic? 
A. \(\left[{NiCl}_4\right]^{2-}\)
B. \(Ni(CO)_4\)
C. \(\left[{Ni}({CN})_4\right]^{2-}\)
D. \(\left[{Ni}\left({H}_2 {O}\right)_6\right]^{2+}\)
E. \({Ni}\left({PPh}_3\right)_4\)

Choose the correct answer from the options given below: 
1. A and D only 
2. A, D and E only 
3. A and C only 
4. B and E only 
Subtopic:  VBT, CFT & their Limitations |
Level 3: 35%-60%
NEET - 2025
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Out of the following complex compounds, which of the compounds will be having the minimum conductance in solution?
1. \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3 \) 2. \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl} \)
3. \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right] \) 4. \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]\)
Subtopic:  Introduction, Classification and Nomenclature |
Level 3: 35%-60%
NEET - 2025
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