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Coordination Compounds · Question 101

AIPMT 2000MCQMedium📈 Topic in 12% papers+4−1
1

Which complex compound will give four isomers?

  1. [Fe(en)3]Cl3
  2. [Co(en)(NH3)2Cl2]Cl
  3. [Fe(PPh3)3NH3ClBr]Cl
  4. [Co(PPh3)3Cl]Cl3

Answer

(2) [Co(en)(NH3)2Cl2]Cl

Solution

[Co(en)(NH3)2Cl2]+ is an octahedral complex of the type [M(AA)a2b2].

Geometrical isomers:

(i) the two Cl trans to each other (two NH3 cis) — has a plane of symmetry, optically inactive;

(ii) the two NH3 trans to each other (two Cl cis) — optically inactive;

(iii) both Cl cis and both NH3 cis — no plane of symmetry, exists as a d and l pair.

Total isomers = 1 + 1 + 2 = 4

[Fe(en)3]3+ gives only 2 (d and l) and [Fe(PPh3)3NH3ClBr]+ (type Ma3bcd) gives 5 stereoisomers.

Answer: (2)

AIPMT 2000

Keep practising — Coordination Compounds

2

Match List I with List II :

  1. A-I, B-III, C-IV, D-II
  2. A-III, B-IV, C-I, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-IV, B-I, C-III, D-II
NEET (UG) 2026
3

Which one of the following is an ambidentate ligand?

  1. Oxalate
  2. Ethane-1,2-diamine
  3. Thiocyanate
  4. Ethylenediaminetetraacetate ion
NEET (UG) 2026
4

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
RE-NEET (UG) 2026
5

Given below are two statements: (Given : oxH2 = HOOC - COOH) 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
RE-NEET (UG) 2026
6

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+
RE-NEET (UG) 2026
7

A 1 : 3 electrolyte in an aqueous solution is

  1. [Co(NH3)3(NO2)3]
  2. [CoCl2(NH3)4]Cl
  3. [CoCl(NH3)5]Cl2
  4. [Co(NH3)6]Cl3
RE-NEET (UG) 2026
8

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
RE-NEET (UG) 2026
9

Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

  1. [Ti(H2O)6]3+
  2. [Mn(CN)6]3-
  3. [Fe(CN)6]3-
  4. [Co(NH3)6]3+
RE-NEET (UG) 2026
10

Out of the following complex compounds, which of the compound will be having the minimum conductance solution?

  1. [Co(NH3)6]Cl3
  2. [Co(NH3)5Cl]Cl
  3. [Co(NH3)3Cl3]
  4. [Co(NH3)4Cl2]
NEET (UG) 2025
11

Which of the following are paramagnetic? 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
NEET (UG) 2025

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