Coordination Compounds · JEE Main previous year questions

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2023 32 questions

Q652023 · 13 Apr 2023 · Shift 1
The mismatched combinations are A. Chlorophyll - Co B. Water hardness - EDTA C. Photography $- [Ag (CN)_{2}]^{-}$ D. Wilkinson catalyst $- [(Ph_{3} P)_{3} RhCl]$ E. Chelating ligand - D-Penicillamine Choose the correct answer from the options given below :
1. A.A and E Only
2. B.D and E Only
3. C.A and C Only
4. D.A, C, and E Only
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Answer: C
Q642023 · 13 Apr 2023 · Shift 2
The total number of stereoisomers for the complex $[Cr (o x)_{2} ClBr]^{3 -}$ (where $o x = oxalate$ ) is :
1. A. $1$
2. B. $3$
3. C. $2$
4. D. $4$
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Answer: B
Q672023 · 13 Apr 2023 · Shift 2
Which of the following complexes will exhibit maximum attraction to an applied magnetic field?
1. A. $[Ni (H_{2} O)_{6}]^{2 +}$
2. B. $[Co (H_{2} O)_{6}]^{2 +}$
3. C. $[Co (en)_{3}]^{3 +}$
4. D. $[Zn (H_{2} O)_{6}]^{2 +}$
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Answer: B
Q622023 · 12 Apr 2023 · Shift 1
Match List I with List II | LIST I Complex | | LIST II CFSE ( $Δ_{0}$ ) | | :--- | :--- | :--- | | A. $[Cu (N H_{3})_{6}]^{2 +}$ | I. | $- 0.6$ | | B. $[Ti (H_{2} O)_{6}]^{3 +}$ | II. | $- 2.0$ | | C. $[Fe (CN)_{6}]^{3 -}$ | III. | $- 1.2$ | | D. $[Ni F_{6}]^{4 -}$ | IV. | $- 0.4$ | Choose the correct answer from the options given below:
1. A.A-I, B-IV, C-II, D-III
2. B.A-III, B-IV, C-I, D-II
3. C.A-II, B-III, C-I, D-IV
4. D.A-I, B-II, C-IV, D-III
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Answer: A
Q632023 · 11 Apr 2023 · Shift 1
The complex that dissolves in water is :
1. A. $F e_{4} [Fe (CN)_{6}]_{3}$
2. B. $(N H_{4})_{3} [As (M o_{3} O_{10})_{4}]$
3. C. $K_{3} [Co (N O_{2})_{6}]$
4. D. $[F e_{3} (OH)_{2} (OAc)_{6}] Cl$
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Answer: D
Q722023 · 11 Apr 2023 · Shift 1
The set which does not have ambidentate ligand(s) is :
1. A. $C_{2} O_{4}^{2 -}, N O_{2}^{-}, NC S^{-}$
2. B. $C_{2} O_{4}^{2 -}$ , ethylene diamine, $H_{2} O$
3. C. $N O_{2}^{-}, C_{2} O_{4}^{2 -}, EDT A^{4 -}$
4. D. $EDT A^{4 -}, NC S^{-}, C_{2} O_{4}^{2 -}$
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Answer: B
Q742023 · 11 Apr 2023 · Shift 1
Which of the following complex has a possibility to exist as meridional isomer?
1. A. $[Pt (N H_{3})_{2} C l_{2}]$
2. B. $[Co (en)_{2} C l_{2}]$
3. C. $[Co (en)_{3}]$
4. D. $[Co (N H_{3})_{3} (N O_{2})_{3}]$
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Answer: D
Q662023 · 11 Apr 2023 · Shift 2
Match List I with List II | LIST I Complex | | LIST II Colour | | :--- | :--- | :--- | | A. $Mg (N H_{4}) P O_{4}$ | I. | brown | | B. $K_{3} [Co (N O_{2})_{6}]$ | II. | white | | C. $MnO (OH)_{2}$ | III. | yellow | | D. $F e_{4} [Fe (CN)_{6}]_{3}$ | IV. | blue | Choose the correct answer from the options given below :
1. A.A-II, B-IV, C-I, D-III
2. B.A-II, B-III, C-I, D-IV
3. C.A-III, B-IV, C-II, D-I
4. D.A-II, B-III, C-IV, D-I
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Answer: B
Q672023 · 10 Apr 2023 · Shift 1
The octahedral diamagnetic low spin complex among the following is :
1. A. $[Co (NH_{3})_{6}]^{3 +}$
2. B. $[NiCl_{4}]^{2 -}$
3. C. $[CoCl_{6}]^{3 -}$
4. D. $[CoF_{6}]^{3 -}$
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Answer: A
Q662023 · 10 Apr 2023 · Shift 2
The correct order of the number of unpaired electrons in the given complexes is A. $[Fe (CN)_{6}]^{3 -}$ B. $[FeF_{6}]^{3 -}$ C. $[CoF_{6}]^{3 -}$ D. $[Cr (oxalate)_{3}]^{3 -}$ E. $[Ni (CO)_{4}]$ Choose the correct answer from the options given below:
1. A.E < A < B < D < C
2. B.A < E < D < C < B
3. C.A < E < C < B < D
4. D.E < A < D < C < B
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Answer: D
Q692023 · 10 Apr 2023 · Shift 2
Match List I with List II $A. B. C. D. List - I Complex [T i (H_{2} O)_{6}]^{2 +} [V (H_{2} O)_{6}]^{2 +} [M n (H_{2} O)_{6}]^{3 +} [F e (H_{2} O)_{6}]^{3 +} I. II. III. IV. List - II Crystal Field splitting energy (Δ_{0}) - 1.2 - 0.6 0 - 0.8$ Choose the correct answer from the options given below:
1. A.A-IV, B-I, C-II, D-III
2. B.A-II, B-IV, C-III, D-I
3. C.A-II, B-IV, C-I, D-III
4. D.A-IV, B-I, C-III, D-II
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Answer: A
Q622023 · 8 Apr 2023 · Shift 1
Which of the following complex is octahedral, diamagnetic and the most stable?
1. A. $N a_{3} [CoC l_{6}]$
2. B. $[Co (H_{2} O)_{6}] C l_{2}$
3. C. $K_{3} [Co (CN)_{6}]$
4. D. $[Ni (N H_{3})_{6}] C l_{2}$
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Answer: C
Q642023 · 8 Apr 2023 · Shift 1
The correct order of spin only magnetic moments for the following complex ions is
1. A. $[Fe (CN)_{6}]^{3 -} < [Co F_{6}]^{3 -} < [MnB r_{4}]^{2 -} < [Mn (CN)_{6}]^{3 -}$
2. B. $[MnB r_{4}]^{2 -} < [Co F_{6}]^{3 -} < [Fe (CN)_{6}]^{3 -} < [Mn (CN)_{6}]^{3 -}$
3. C. $[Fe (CN)_{6}]^{3 -} < [Mn (CN)_{6}]^{3 -} < [Co F_{6}]^{3 -} < [MnB r_{4}]^{2 -}$
4. D. $[Co F_{6}]^{3 -} < [MnB r_{4}]^{2 -} < [Fe (CN)_{6}]^{3 -} < [Mn (CN)_{6}]^{3 -}$
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Answer: C
Q612023 · 8 Apr 2023 · Shift 2
Match List I with List II $A. B. C. D. LIST I Coordination Complex [Cr (CN)_{6}]^{3 -} [Fe (H_{2} O)_{6}]^{2 +} [Co (N H_{3})_{6}]^{3 +} [Ni (N H_{3})_{6}]^{2 +} I. II. III. IV. LIST II Number of unpaired electrons 0324$ Choose the correct answer from the options given below:
1. A.A-IV, B-III, C-II, D-I
2. B.A-II, B-I, C-IV, D-III
3. C.A-II, B-IV, C-I, D-III
4. D.A-III, B-IV, C-I, D-II
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Answer: C
Q872023 · 6 Apr 2023 · Shift 1· Numerical answer
Number of ambidentate ligands in a representative metal complex $[M (en) (SCN)_{4}]$ is ________. [en = ethylenediamine]
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Answer: 4
Q672023 · 6 Apr 2023 · Shift 2
Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A : In the complex $Ni (CO)_{4}$ and $Fe (CO)_{5}$ , the metals have zero oxidation state. Reason R : Low oxidation states are found when a complex has ligands capable of $π$ -donor character in addition to the $σ$ -bonding. In the light of the above statements, choose the most appropriate answer from the options given below
1. A.A is not correct but R is correct
2. B.A is correct but R is not correct
3. C.Both A and R are correct but R is NOT the correct explanation of A
4. D.Both A and R are correct and R is the correct explanation of A
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Answer: B
Q712023 · 6 Apr 2023 · Shift 2
The IUPAC name of $K_{3} [Co (C_{2} O_{4})_{3}]$ is:-
1. A.Potassium tris(oxalato)cobalt(III)
2. B.Potassium tris(oxalato)cobaltate(III)
3. C.Potassium trioxalatocobaltate(III)
4. D.Potassium trioxalatocobalt(III)
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Answer: C
Q812023 · 6 Apr 2023 · Shift 2· Numerical answer
The number of species having a square planar shape from the following is ___________. $Xe F_{4}, S F_{4}, Si F_{4}, B F_{4}^{-}, Br F_{4}^{-}, [Cu (N H_{3})_{4}]^{2 +}, [FeC l_{4}]^{2 -}, [PtC l_{4}]^{2 -}$
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Answer: 4
Q692023 · 1 Feb 2023 · Shift 1
A solution of $FeCl_{3}$ when treated with $K_{4} [Fe (CN)_{6}]$ gives a Prussian blue precipitate due to the formation of :
1. A. $Fe [Fe (CN)_{6}]$
2. B. $Fe_{4} [Fe (CN)_{6}]_{3}$
3. C. $Fe_{3} [Fe (CN)_{6}]_{2}$
4. D. $K [Fe_{2} (CN)_{6}]$
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Answer: B
Q732023 · 31 Jan 2023 · Shift 1
Cobalt chloride when dissolved in water forms pink colored complex $\underline{X}$ which has octahedral geometry. This solution on treating with conc $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry. $X$ , $Y$ and $Z$ , respectively, are
1. A. $X = [Co (H_{2} O)_{6}]^{2 +}, Y = [CoCl_{4}]^{2 -}, Z = Tetrahedral$
2. B. $X = [Co (H_{2} O)_{6}]^{2 +}, Y = [CoCl_{6}]^{3 -}, Z = Octahedral$
3. C. $X = [Co (H_{2} O)_{4} Cl_{2}]^{+}, Y = [CoCl_{4}]^{2 -}, Z = Tetrahedral$
4. D. $X = [Co (H_{2} O)_{6}]^{3 +}, Y = [CoCl_{6}]^{3 -}, Z = Octahedral$
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Answer: A
Q882023 · 31 Jan 2023 · Shift 2· Numerical answer
If the CFSE of $[Ti (H_{2} O)_{6}]^{3 +}$ is $- 96.0 kJ/mol$ , this complex will absorb maximum at wavelength ___________ nm. (nearest integer) Assume Planck's constant $(h) = 6.4 \times 1 0^{- 34} Js$ , Speed of light $(c) = 3.0 \times 1 0^{8} m/s$ and Avogadro's Constant $(N_{A}) = 6 \times 1 0^{23} / mol$
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Answer: 480
Q612023 · 30 Jan 2023 · Shift 1
To inhibit the growth of tumours, identify the compounds used from the following : A. EDTA B. Coordination Compounds of Pt C. D - Penicillamine D. Cis - Platin Choose the correct answer from the option given below :
1. A.A and B Only
2. B.C and D Only
3. C.B and D Only
4. D.A and C Only
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Answer: C
Q662023 · 30 Jan 2023 · Shift 1
Which of the following is correct order of ligand field strength?
1. A. $S^{2 -} < C_{2} O_{4}^{2 -} < NH_{3} < en < CO$
2. B. $CO < en < NH_{3} < C_{2} O_{4}^{2 -} < S^{2 -}$
3. C. $S^{2 -} < NH_{3} < en < CO < C_{2} O_{4}^{2 -}$
4. D. $NH_{3} < en < CO < S^{2 -} < C_{2} O_{4}^{2 -}$
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Answer: A
Q892023 · 29 Jan 2023 · Shift 1· Numerical answer
The sum of bridging carbonyls in $W (CO)_{6}$ and $M n_{2} (CO)_{10}$ is ____.
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Answer: 0
Q682023 · 29 Jan 2023 · Shift 2
Correct order of spin only magnetic moment of the following complex ions is : (Given At.no. Fe : 26, Co : 27)
1. A. $[Co F_{6}]^{3 -} > [Fe F_{6}]^{3 -} > [Co (C_{2} O_{4})_{3}]^{3 -}$
2. B. $[Fe F_{6}]^{3 -} > [Co (C_{2} O_{4})_{3}]^{3 -} > [Co F_{6}]^{3 -}$
3. C. $[Fe F_{6}]^{3 -} > [Co F_{6}]^{3 -} > [Co (C_{2} O_{4})_{3}]^{3 -}$
4. D. $[Co (C_{2} O_{4})_{3}]^{3 -} > [Co F_{6}]^{3 -} > [Fe F_{6}]^{3 -}$
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Answer: C