Coordination Chemistry Quiz | Chemistry Quiz
All transition elements exhibit a characteristic property of complex ion formation. The compounds containing complex ions are called coordination compounds. The branch of chemistry in which coordination compounds are studied that are called coordination chemistry.
Double Salts and Coordination Compounds.
When solutions of two or more stable compounds are mixed in stoichiometric (simple molecular) proportions new crystalline compounds called molecular or addition compounds are formed. These are of two types,
(1) Double salts, (2) Co-ordination or Complex compounds
(1) Double salts: Addition compounds, stable in solid-state. Dissociate into ions in aqueous solution as such give test for each constituent ion.
(2) Co-ordination or Complex compounds: Addition compound, stable in solid-state. Retain their identity even in a solution. Central metal ion form dative or coordinate bond with the species surrounding it (ligands).
1. Which of the following ligands forms a chelate
(a) Acetate (b) Oxalate
(c) Cyanide (d) Ammonia
2. According to Werner's theory
(a) Primary valency can be ionized
(b) Secondary valency can be ionized
(c) Primary and secondary valencies both cannot be ionized
(d) Only primary valency cannot be ionized
3. Bidentate ligand is
(b) Ethylene diammine (en)
4. Which is the example of hexadentate ligand
(a) 2, 2—dipyridyl
(b) Dimethyl glyoxime
(c) Aminodiacetate ion
(d) Ethylene diammine tetra acetate ion [EDTA]
5. According to Lewis the ligands are
(a) Acidic in nature
(b) Basic in nature
(c) Neither acidic nor basic
(d) Some are acidic and others are basic
SOL: (b)According to Lewis the ligands are basic in nature.
6. The coordination number of a central metal atom in a complex is determined by
(a) The number of ligands around a metal ion bonded by sigma and pi-bonds both.
(b) The number around a metal ion bonded by pi-bonds
(c) The number of ligands around a metal ion bonded by sigma bonds
(d) The number of only anionic ligands bonded to the metal ion
SOL: (c) The number of atoms of the ligand that are directly bounded to the central metal atom or ion by coordinate bond is known as the coordination number of the metal atom or ion coordination number of metal = number of bonds formed by metal with ligand .
7. Generally, a group of atoms can function as a ligand if
(a) They are positively charged ions
(b) They are free radicals
(c) They are either neutral molecules or negatively charged ions
(d) None of these
SOL: (c) Ligand must have capacity to donate lone pair of electrons to form co-ordinate bond.
8. Co-ordination number of aluminum is
(a) 8 (b) 6
(c) 12 (d) 4
SOL: (b)Al- has 6 co-ordination number.
Nomenclature, Oxidation state and EAN number Quiz
9. Which complexes have zero oxidation state
SOL: (a) Complexes containing carbonyl ligand CO have zero oxidation state.
10. The valency of cuprammonium ion is
(a) + 4 (b) + 2
(c) – 2 (d) – 4
11. The neutral ligand is
(a) Chloro (b) Hydroxo
(c) Ammine (d) Oxalato
SOL: (c) Ammine NH2 is neutral ligand.
12. The ligands which can get attached to the central metal ion through more than one atom are called
(a) Ambident ligands
(b) Polydentate ligands
(c) Chelate ligands
(d) Neutral ligands
13. A strong ligand gives a complex which is generally called
(a) High spin
(b) High energy
(c) Low spin
SOL: (c) A strong field ligand produces low spin complexes.
14. CN- is a strong field ligand. This is due to the fact that
(a) It can accept electron from metal species
(b) It forms high spin complexes with metal species
(c) It carries negative charge.
(d) It is a pseudohalide
SOL: (d) Cyanide ion is strong field ligand because it is a pseudohalide ion pseudohalide ions are stronger coordinating ligand & they have the ability to form bond (from the pseudohalide to the metal) and bond (from the metal to pseudohalide).
15. A complex involving hybridization has
(a) A square planar geometry
(b) A tetrahedral geometry
(c) An octahedral geometry
(d) Trigonal planar geometry
Application of organometallics Quiz
16. Which of the following is an organo-metallic compound
(a) Lithium ethoxide
(b) Ethyl lithium
(c) Lithium acetate
(d) Lithium carbide
17. Which of the following is not an organometallic compound
(a) Ethyl magnesium bromide
(b) Tetraethyl lead
(c) Sodium ethoxide
(d) Trimethyl aluminium
SOL: (c) Organometallic compounds are those compounds in which carbon atom is directly linked to metal. But in sodium ethoxide as oxygen is attached to sodium metal so it is not a organometallic compound.
18. An organometallic compound amongst the following is
(c) Tetraethyl lead (TEL)
(d) All of these