Coordination Compounds · JEE Main previous year questions

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2020 17 questions

Q542020 · 3 Sept 2020 · Shift 1
The complex that can show optical activity is :
1. A. $cis - [Fe (N H_{3})_{2} (CN)_{4}]^{-}$
2. B. $trans - [Cr (C l_{2}) (ox)_{2}]^{3 -}$
3. C. $trans - [Fe (N H_{3})_{2} (CN)_{4}]^{-}$
4. D. $cis - [CrC l_{2} (ox)_{2}]^{3 -}$ (ox = oxalate)
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Answer: D
Q602020 · 3 Sept 2020 · Shift 1
The electronic spectrum of $[Ti (H_{2} O)_{6}]^{3 +}$ shows a single broad peak with a maximum at $20, 300 c m^{- 1}$ . The crystal field stabilization energy (CFSE) of the complex ion, in $kJ mo l^{- 1}$ , is : ( $1 kJ mo l^{- 1} = 83.7 c m^{- 1}$ )
1. A.83.7
2. B.242.5
3. C.145.5
4. D.97
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Answer: D
Q572020 · 3 Sept 2020 · Shift 2
The d-electron configuration of $[Ru (en)_{3}] C l_{2}$ and $[Fe (H_{2} O)_{6}] C l_{2}$ , respectively are :
1. A. $t_{2 g}^{4} e_{g}^{2}$ and $t_{2 g}^{6} e_{g}^{0}$
2. B. $t_{2 g}^{6} e_{g}^{0}$ and $t_{2 g}^{6} e_{g}^{0}$
3. C. $t_{2 g}^{6} e_{g}^{0}$ and $t_{2 g}^{4} e_{g}^{2}$
4. D. $t_{2 g}^{4} e_{g}^{2}$ and $t_{2 g}^{4} e_{g}^{2}$
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Answer: C
Q582020 · 2 Sept 2020 · Shift 1
For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements: (I) both the complexes can be high spin. (II) Ni(II) complex can very rarely be low spin. (III) with strong field ligands, Mn(II) complexes can be low spin. (IV) aqueous solution of Mn(II) ions is yellow in colour. The correct statements are :
1. A.(I), (III) and (IV) only
2. B.(I) and (II) only
3. C.(II), (III) and (IV) only
4. D.(I), (II) and (III) only
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Answer: D
Q592020 · 2 Sept 2020 · Shift 1
Consider that a $d^{6}$ metal ion ( $M^{2 +}$ ) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is $4.90 BM$ . The geometry and the crystal field stabilization energy of the complex is
1. A.tetrahedral and $- 1.6 Δ_{t} + 1 P$
2. B.octahedral and $- 2.4 Δ_{0} + 2 P$
3. C.tetrahedral and $- 0.6 Δ_{t}$
4. D.octahedral and $- 1.6 Δ_{0}$
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Answer: C
Q572020 · 2 Sept 2020 · Shift 2
1. A.A-(i), B-(ii), C-(iii)
2. B.A-(ii), B-(iii), C-(i)
3. C.A-(ii), B-(i), C-(iii)
4. D.A-(iii), B-(i), C-(ii)
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Answer: D
Q552020 · 9 Jan 2020 · Shift 1
$[Pd (F) (Cl) (Br) (I)]^{2 -}$ has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of $[Fe (CN)_{6}]^{n - 6}$ , respectively, are: [Note : Ignore the pairing energy]
1. A. $1.73 BM and - 2.0 Δ_{0}$
2. B. $5.92 BM and 0$
3. C. $2.84 BM and - 1.6 Δ_{0}$
4. D. $0 BM and - 2.4 Δ_{0}$
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Answer: A
Q522020 · 9 Jan 2020 · Shift 2
The correct order of the spin-only magnetic moments of the following complexes is : (I) $[Cr (H_{2} O)_{6}] B r_{2}$ (II) $N a_{4} [Fe (CN)_{6}]$ (III) $N a_{3} [Fe (C_{2} O_{4})_{3}] (Δ_{0} > P)$ (IV) $(E t_{4} N)_{2} [CoC l_{4}]$
1. A.(III) > (I) > (II) > (IV)
2. B.(II) $\approx$ (I) > (IV) > (III)
3. C.(III) > (I) > (IV) > (II)
4. D.(I) > (IV) > (III) > (II)
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Answer: D
Q632020 · 9 Jan 2020 · Shift 2
The isomer(s) of $[Co (N H_{3})_{4} C l_{2}]$ that has/have a Cl–Co–Cl angle of $9 0^{\circ}$ , is/are :
1. A.cis only
2. B.cis and trans
3. C.meridional and trans
4. D.trans only
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Answer: A
Q512020 · 8 Jan 2020 · Shift 1
The complex that can show fac- and mer-isomers is :
1. A. $[CoC l_{2} (en)_{2}]$
2. B. $[Pt (N H_{3})_{2} C l_{2}]$
3. C. $[Co (N H_{3})_{3} (N O_{2})_{3}]$
4. D. $[Co (N H_{3})_{4} C l_{2}]^{+}$
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Answer: C
Q612020 · 8 Jan 2020 · Shift 2
Among (a) - (d) the complexes that can display geometrical isomerism are : (a) $[Pt (N H_{3})_{3} Cl]^{+}$ (b) $[Pt (N H_{3}) C l_{5}]^{-}$ (c) $[Pt (N H_{3})_{2} Cl (N O_{2})]$ (d) $[Pt (N H_{3})_{4} ClBr]^{2 +}$
1. A.(a) and (b)
2. B.(c) and (d)
3. C.(d) and (a)
4. D.(b) and (c)
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Answer: B
Q652020 · 8 Jan 2020 · Shift 2
The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is: (A) $Ni (CO)_{4}$ (B) $[Ni (H_{2} O)_{6}] C l_{2}$ (C) $N a_{2} [Ni (CN)_{4}]$ (D) $PdC l_{2} (PP h_{3})_{2}$
1. A. $(C) < (D) < (B) < (A)$
2. B. $(C) \approx (D) < (B) < (A)$
3. C. $(A) \approx (C) \approx (D) < (B)$
4. D. $(A) \approx (C) < (B) \approx (D)$
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Answer: C
Q742020 · 8 Jan 2020 · Shift 2· Numerical answer
Complexes $(ML_{5})$ of metals $Ni$ and $Fe$ have ideal square pyramidal and trigonal bipyramidal geometries, respectively. The sum of the $9 0^{\circ}$ , $12 0^{\circ}$ and $18 0^{\circ}$ L-M-L angles in the two complexes is _______.
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Answer: 20
Q522020 · 7 Jan 2020 · Shift 1
The theory that can completely/properly explain the nature of bonding in $[Ni (CO)_{4}]$ is :
1. A.Werner's theory
2. B.Valence bond theory
3. C.Crystal field theory
4. D.Molecular orbital theory
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Answer: D
Q602020 · 7 Jan 2020 · Shift 1
The IUPAC name of complex $[Pt (N H_{3})_{2} Cl (N H_{2} C H_{3})] C l$ is :
1. A.Diamminechlorido (methanamine) platinum(II)chloride.
2. B.Bisammine (methanamine)chlorido platinum(II)chloride.
3. C.Diamminechlorido (amminomethane) platinum(II) chloride.
4. D.Diammine (methanamine) chlorido platinum(II)Chloride.
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Answer: A
Q562020 · 7 Jan 2020 · Shift 2
The number of possible optical isomers for the complexes $M A_{2} B_{2}$ with $s p^{3}$ and $ds p^{2}$ hybridized metal atom, respectively, is : Note : A and B are unidentate neutral and unidentate monoanionic ligands, respectively.
1. A.0 and 2
2. B.0 and 0
3. C.0 and 1
4. D.2 and 2
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Answer: B
Q652020 · 7 Jan 2020 · Shift 2
Among the statements(a)-(d) the incorrect ones are : (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments. (b) When $Δ_{0} < P$ , the d-electron configuration of Co(III) in an octahedral complex is $t_{2 g}^{4} e_{g}^{2}$ (c) Wavelength of light absorbed by $[Co (en)_{3}]^{3 +}$ is lower than that of $[Co F_{6}]^{3 -}$ (d) If the $Δ_{0}$ for an octahedral complex of Co(III) is $18, 000 cm^{- 1}$ , the $Δ_{t}$ for its tetrahedral complex with the same ligand will be $16, 000 cm^{- 1}$
1. A.(a) and (b) only
2. B.(b) and (c) only
3. C.(c) and (d) only
4. D.(a) and (d) only
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Answer: D