According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is:
1. Cl- > NH3 > H2O > CO
2. CO > NH3 > H2O > Cl-
3. CO > H2O > NH3 > Cl-
4. Cl- > H2O > NH3 > CO

Subtopic:  Ligands | VBT, CFT & their Limitations |
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In potash alum, the ratio of K+ and SO42- ions is:
1. 3:2
2. 1:2
3. 2:1
4. 2:3
Subtopic:  Introduction, Classification and Nomenclature |
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A 1:3 electrolyte in an aqueous solution is :
1. \([Co(NH_3)_3(NO_2)_3]\)
2. \([CoCl_2(NH_3)_4]Cl\)
3. \([CoCl(NH_3)_5]Cl_2\)
4. \([Co(NH_3)_6]Cl_3\)
Subtopic:  Isomerism in Coordination Compounds |
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NEET - 2026
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The complex which has facial and meridional isomers is:
(Given : py = pyridine and en = H2N-CH2-CH2-NH2)
1. [Ni(en)2(H2O)2]2+
2. [Cr(py)3(Cl)3]
3. [Cr(H2O)6]3+
4. [Co(NH3)4(H2O)2]3+
Subtopic:  Isomerism in Coordination Compounds |
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Given below are two statements:
Statement-I: [Fe(ox)3]3- is chiral.
Statement-II: trans-[Cr(H2O)2(ox)2]- is chiral.

(Given \(\left.\mathrm{oxH}_2=\mathrm{HOOC}-\mathrm{COOH}\right)\)
In light of the above statements, choose the most appropriate answer from the options given below:
 
1. Statement-I is incorrect but Statement-II is correct.
2. Both Statement-I and Statement-II are correct.
3. Both Statement-I and Statement-II are incorrect.
4. Statement-I is correct but Statement-II is incorrect.
Subtopic:  Isomerism in Coordination Compounds |
Level 3: 35%-60%
NEET - 2026
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The formula of tetraammineaquachloridocobalt(III) chloride is:
1. [Co(NH3)4(H2O)Cl]Cl2
2. [Co(NH3)4Cl2] × H2O
3. [Co(NH3)4]Cl3 × H2O
4. [Co(NH3)4(H2O)Cl]Cl
Subtopic:  Introduction, Classification and Nomenclature |
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Match List I with List II:
List-I List-II
A. \([{Pt(NH_3)_2Cl_2}]\) I. Optical
B. \([Co(en)_3]^{3+}\) II. Solvate
C. \([Co(NH_3)_5NO_2]Cl_2\) III. Geometrical
D. \([Cr(H_2O)_6]Cl_3\) IV. Linkage

Choose the correct answer from the options given below:
1. A-III, B-I, C-II, D-IV
2. A-I, B-III, C-II, D-IV
3. A-III, B-I, C-IV, D-II
4. A-II, B-IV, C-III, D-I
Subtopic:  Isomerism in Coordination Compounds |
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NEET - 2026
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Which one of the following is an ambidentate ligand?
1. Ethylenediaminetetraacetate ion
2. Oxalate
3. Ethane-1,2-diamine
4. Thiocyanate
Subtopic:  Ligands |
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Match the following:
List-I
(Complex/ ion)
List-II
(Shape/geometry)
A. \([Pt(Cl_2)(NH_3)_2]\) I. Octahedral
B. \([Co(NH_3)_6]Cl_3\) II. Trigonal bipyramidal
C. \([NiCl_4]^{2-}\) III. Square planar
D. \([Fe(CO)_5]\) IV. Tetrahedral

Choose the correct answer from the options given below:
1. A-I, B-III, C-IV, D-II
2. A-III, B-IV, C-I, D-II
3. A-IV, B-I, C-III, D-II
4. A-III, B-I, C-IV, D-II
Subtopic:  VBT, CFT & their Limitations |
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NEET - 2026
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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 |
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NEET - 2025
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