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
-
Denticity
-
Indirect agonist
-
Cooperativity
-
Homoaromaticity
A
Correct answer
Explanation
Denticity refers to the number of atoms in a single ligand that bind to a central atom in a coordination complex.
-
Potassium cyanide
-
Potassium ferrioxalate
-
Potassium bicarbonate
-
Potassium bifluoride
B
Correct answer
Explanation
Potassium ferrioxalate is an octahedral transition metal complex in which three bidentate oxalate ions are bound to an iron center. Potassium acts as a counterion, balancing the -3 charge of the complex.
-
perchloryl fluoride
-
platinum hexafluoride
-
selenium tetrafluoride
-
silver(II) fluoride
B
Correct answer
Explanation
Platinum hexafluoride is the chemical compound. It is a dark-red volatile solid that forms a red gas. The compound is a unique example of platinum in the +6 oxidation state. With only four d-electrons, it is paramagnetic with a triplet ground state.
B
Correct answer
Explanation
This option is correct as diamagnetic behaviour is shown by those subustances which contain fully filled orbitals. No unpaired electron is present, and this condition is fulfilled by the NaCl. This subustance is weakly repelled by external magnetic field.
-
Cyclopentadienyl complex
-
Metallocene
-
Sandwich compound
-
Transition metal carbene
D
Correct answer
Explanation
A transition metal carbene complex is a organometallic compound featuring a divalent organic ligand. The divalent organic ligand coordinated to the metal center is called a carbene. Carbene complexes for almost all transition metals have been reported.
-
Monometallic half sandwich compounds
-
Dimetallic half sandwich compounds
-
Multidecker sandwiches
-
Inverse sandwiches
D
Correct answer
Explanation
In these anti-bimetallic compounds, the metals are found to be bridged by a single carbocyclic ring. Examples include {(THF)3Ca}2(1,3,5-triphenylbenzene) and {(Ar) Sn}2COT.
-
Difluorocarbene
-
Fischer carbenes
-
Schrock carbenes
-
N-heterocyclic carbenes
B
Correct answer
Explanation
Fischer carbenes can be likened to ketones, with the carbene carbon being electrophilic, much like the carbonyl carbon of a ketone. Like ketones, Fischer carbene species can undergo Aldol-like reactions. The hydrogen atoms attached to the carbon α to the carbene carbon are acidic, and can be deprotonated by a base such as n-butyllithium, to give a nucleophile which can undergo further reaction.
-
1, 2 and 5
-
1, 4 and 5
-
2, 3 and 4
-
1, 3 and 5
-
3, 4 and 5
A
Correct answer
Explanation
CCl4, SO4-- and NH4+: All have sp3 hybridization and tetrahedral geometry.
B
Correct answer
Explanation
Correct option. Both Fe+3 and Mn+2 have 5 electrons in d orbital.
-
Cu2+, Zn2+, Sc3+
-
Zn2+, Sc3+, Ti4+
-
Cu+, Mn2+, Cr3+
-
Ni2+, Cu2+, Zn2+
-
Cu+, Mn2+, Sc3+
B
Correct answer
Explanation
Zn2+: [Ar] 3d10 4s0; no unpaired electron; diamagnetic
Sc3+: [Ar] 3d0 4s0; ; no unpaired electron; diamagnetic
Ti4+: [Ar] 3d0 4s0; no unpaired electron; diamagnetic
-
[Pt(py)(NH3)(NO2)(Cl)(Br)(I)]
-
[Ir(C2O4)2Cl2]2-
-
Trans-[Co(en)2Cl2]+
-
[Ni(CO)4]
-
None of these
-
ionisation isomer
-
linkage isomer
-
coordination isomer
-
hydrated isomer
-
None of these
-
[Ni(CN)4]2-, [Ni(Cl)4]2-
-
[MnCl4]2-, [Ni(CO)4]
-
[CuCl4]2-, [Cu(NH3)4]2+
-
[Ni(CN)4]2-, [Ni(CO)4]
-
None of these
B
Correct answer
Explanation
Correct option: One C2 axis and two vertical planes. Hence, point group is C2v.