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Coordination Compounds

JEE Main 2024 (Online) 5th April Morning ShiftMCQEasy📈 Topic in 54% papers+4−1
Ques. 1JEE Main 2024, 5 April (Morning Shift)

Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27]

  1. [Fe(H2O)6]2+
  2. [Mn(H2O)6]2+
  3. [Co(H2O)6]2+
  4. [Cr(H2O)6]2+

Answer

(3) [Co(H2O)6]2+

Solution

H2O is a weak-field ligand ⇒ all are high spin; = n(n + 2) BM (n = unpaired electrons)

(A): Fe2+, 3d6 ⇒ n = 4, = 4.90 BM

(B): Mn2+, 3d5 ⇒ n = 5, = 5.92 BM

(C): Co2+, 3d7 ⇒ n = 3, = 3.87 BM

(D): Cr2+, 3d4 ⇒ n = 4, = 4.90 BM

∴ fewest unpaired electrons ⇒ [Co(H2O)6]2+ is least paramagnetic

Answer: (3)

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Ques. 2JEE Main 2024, 5 April (Evening Shift)

The number of complexes from the following with no electrons in the t2 orbital is . TiCl4, [MnO4]-, [FeO4]2-, [FeCl4]-, [CoCl4]2-

  1. 4
  2. 2
  3. 3
  4. 1
Ques. 3JEE Main 2024, 5 April (Evening Shift)

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves sp3 hybridization. The number of geometrical isomers exhibited by the complex is :

  1. 0
  2. 2
  3. 3
  4. 4
Ques. 4JEE Main 2024, 4 April (Morning Shift)

Number of complexes from the following with even number of unpaired "d" electrons is [V(H2O)6]3+, [Cr(H2O)6]2+, [Fe(H2O)6]3+, [Ni(H2O)6]3+, [Cu(H2O)6]2+ [Given atomic numbers: V = 23, Cr = 24, Fe = 26, Ni = 28, Cu = 29]

  1. 1
  2. 5
  3. 2
  4. 4
Ques. 5JEE Main 2024, 4 April (Morning Shift)

The correct sequence of ligands in the order of decreasing field strength is :

  1. NCS- > EDTA4- > CN- > CO
  2. CO > H2O > F- > S2-
  3. S2- > -OH > EDTA4- > CO
  4. -OH > F- > NH3 > CN-
Ques. 6JEE Main 2024, 4 April (Evening Shift)

If an iron (III) complex with the formula [Fe(NH3)x(CN)y]- has no electron in its eg orbital, then the value of x + y is

  1. 6
  2. 4
  3. 3
  4. 5
Ques. 7JEE Main 2024, 4 April (Evening Shift)

The number of unpaired d-electrons in [Co(H2O)6]3+ is .

  1. 0
  2. 2
  3. 1
  4. 4
Ques. 8JEE Main 2024, 1 February (Morning Shift)

Which of the following complex is homoleptic?

  1. [Ni(NH3)2Cl2]
  2. [Co(NH3)4Cl2]+
  3. [Fe(NH3)4Cl2]+
  4. [Ni(CN)4]2-
Ques. 9JEE Main 2024, 1 February (Morning Shift)

Given below are two statements : In the 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
Ques. 10JEE Main 2024, 1 February (Evening Shift)

[Co(NH3)6]3+ and [CoF6]3- are respectively known as :

  1. Inner orbital Complex, Spin paired Complex
  2. Spin paired Complex, Spin free Complex
  3. Spin free Complex, Spin paired Complex
  4. Outer orbital Complex, Inner orbital Complex
Ques. 11JEE Main 2024, 31 January (Morning Shift)

The correct statements from following are: Choose the correct answer from the options given below:

  1. B, C only
  2. B, D only
  3. A, C only
  4. A, D only

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