Chemistry

Coordination Chemistry

325 Questions

Coordination chemistry focuses on coordination compounds, their structures, and their magnetic properties. The questions cover primary and secondary valencies, ligand types, and geometries of complexes. This topic is heavily tested in chemistry competitive exams and requires a good grasp of molecular structures.

primary and secondary valencycomplex geometriesligand field theorymagnetic properties of complexesisomerism in complexes

Coordination Chemistry Questions

Multiple choice

Which of the following complexes is correctly named?

  1. K3[Fe(CN)6] : Tripotassium hexacyanoferrate(III)

  2. K4[Fe(CN)6] : Potassium hexacyanoferrate(IV)

  3. [Cu(NH3)4](NO32 : Tetraamminecuprate(II) nitrate

  4. [Cr(NCS)4(NH3)2]- : Diamminetetrathiocyanatochromate(III) ion

  5. [Co(C2O4)(en)2]+ : Diethylenediammineoxalatocobalt(III) ion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is correctly named. [Cr(NCS)4(NH3)2]- : Diamminetetrathiocyanatochromate(III) ion 

Multiple choice

Which of the following ‘Formula : Name’ combinations is incorrect?

  1. [Pt(NH3)3Br(NO2)Cl]Cl: Triamminebromochloronitroplatinum(IV) chloride

  2. [Cr(NH3)4(OH)2]Br: Tetraamminedihydroxochromate(III) bromide

  3. [Cr(en)2(NH3)Cl]SO4: Amminechlorobis(ethylenediamine)chromium(III) sulfate

  4. [Al(H2O)4(OH)2]Cl: Tetraaquadihydroxoaluminum(III) chloride

  5. Na2[CuCl4]: Sodium tetrachlorocuprate(II)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct IUPAC name of [Cr(NH3)4(OH)2]Br is tetraamminedihydroxochromium(III) bromide.

Multiple choice

Which of the following coordination complexes is not correctly named?

  1. [Ni(NH3)4](ClO42: Tetraamminenickel(II) perchlorate

  2. [Au(CN)2]-: Dicyanoaurate(I) ion

  3. K3[Co(NO2)6]: Potassium hexanitrocobaltate(III)

  5. [Fe(H2O)6]3+: Hexaaquairon(III) ion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct IUPAC name of [Pt(en)(ONO)Cl] is chloro(ethylenediamine)nitritoplatinum(II).

Multiple choice

Which of the following complexes are diamagnetic in nature? (1) [CoF6]3-
(2) [Fe(CN)6]4-
(3) [Ni(CN)4]2-
(4) Zn(H2O)6]2+
(5) [Cr(H2O)6]3+

  1. 1, 2 and 3 only

  2. 2, 3 and 4 only

  3. 3, 4 and 5 only

  4. 1 and 5 only

  5. 3 and 5 only
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

[Fe(CN)6]4- is an inner orbital complex with octahedral geometry (d2sp3 hybridisation); no unpaired electrons; diamagnetic [Ni(CN)4]2- is an inner orbital complex with square planar geometry (dsp2 hybridisation); no unpaired electrons; diamagnetic Zn(H2O)6]2+ is an outer orbital complex with square planar geometry (sp3d2 hybridisation); no unpaired electrons; diamagnetic

Multiple choice

Which of the following pairs represents inner orbital complexes only?

  1. [Co(NH3)6]3+ and [Cr(H2O)6]3+

  2. [FeF6]3- and [Zn(H2O)6]2+

  3. [Co(NH3)6]3+ and [Zn(H2O)6]2+

  4. [FeF6]3- and [Cr(H2O)6]3+

  5. [Zn(H2O)6]2+ and [Cr(H2O)6]3+
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

[Co(NH3)6]3+ is an inner orbital complex with octahedral geomtry (d2sp3 hybridisation). [Cr(H2O)6]3+ is an inner orbital complex with octahedral geomtry (d2sp3 hybridisation).

Multiple choice

Assertion: [Cu(en)2]+2 is more stable than [Cu(NH3)4]+2. Reason: Both these complexes have a square planar shape.

  1. Both A and R is true and R is the correct explanation of A.

  2. Both A and R is true but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.

  5. Both A and R are false.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because the correct explanation of A is [Cu(en)2]+2 contains two rings whereas there is no any ring in [Cu(NH3)4]+2.