Chemistry

Coordination Chemistry

319 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

The complex with tetrahedral geometry is ____________.

  1. [NiCl4]2-

  2. [Ni(CN)4]2-

  3. Cis-platin

  4. Carboplatin

  5. Zeise’s salt
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In case of tetrahedral configuration, the compound would have a magnetic moment corresponding to two unpaired electrons. [NiCl4]2- has two unpaired electrons and a tetrahedral geometry.

Multiple choice

Identify the unmatched pair.

  1. Wilkinson’s catalyst - Ph3RhCl/Et3Al

  2. Lindlar catalyst - PtO2

  3. Lazier’s catalyst - Cu2Cr2O5

  4. Vaska's complex - IrCl(CO)(PPh3)2

  5. Adkins catalyst - Cr/CuO
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lindlar catalyst is the combination of Pd/CaCO3/PbO. PtO2 is the Adam’s catalyst.

Multiple choice

Co-ordination number can be defined as

  1. Ring forming ligands

  2. Number of monodentate ligands linked to central atom

  3. Ligands capable of accepting π-e- density

  4. Ligand & central metal ion kept in square bracket
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Co-ordination Number is the number of monodentate ligands attached to central atom/ion .

Multiple choice

[Ag(NH3)]2+ is a

  1. complex ion

  2. double salt

  3. cations

  4. radicals

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A complex ion is an ion that contains a metal cation binded to one or more small molecules or ions (such as NH3, CN- or OH-). 

Multiple choice

Complexes having bidentate ligands are known as

  1. co-ordination sphere

  2. chelates

  3. central metal atom or ion

  4. complex ion

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bidentate ligands are often referred to as chelating ligands because they can grab a metal atom in two places. A complex that contains a chelating ligand is called a chelate.

Multiple choice

The Quadruple bonds occurs in which of the followings compound?

  1. [Re2Cl8]--

  2. [Pt(Cl)2(PPh3)2]

  3. [Co(NH3)4Cl2]

  4. [Mn2(CO)10]

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct, because two Re atoms have eight electrons will occupy one sigma. Two pi and one delta bonding to form quadruple bonds between two Re atoms, i.e., Re-Re distance short to exist eclipsed form.

Multiple choice

In which category, the compound [Fe4C(CO)12]-2 belong to?

  1. Closo

  2. Nido

  3. Hypho

  4. Arachno

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because in this carbonyl compound, total electron counts to be 62,  and electron used for non skeletal bonding is 48. Therefore skeletal electron pair available for frame work bonding 1/2[62 - 48]=7e pairs, i.e., m = 4,  hence occupies (4+3)e pairs,  predicted in (m+4) rule.

Multiple choice

Which of the following metal carbonyl absorbs lowest infrared frequency?

  1. [V(CO)6]-

  2. [Ti(CO)6]--

  3. [Mn(CO)6]+

  4. [Cr(CO)6]

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct,  because the two excess electron of metal ions shifted towards antibonding MOs of CO ligand resulting CO bond order is very low, due to this fact infrared frequency highly decreases.