NOUN TMA Questions and Answers: CHM423- Coordination Chemistry

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NOUN TMA Questions and Answers: CHM423- Coordination Chemistry

Postby Adebisi » Thu Jan 31, 2019 5:32 am

NOUN TMA Questions and Answers: CHM423- Coordination Chemistry


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Q1 The stoichiometric ratio is appropriately defined as

the mole ratio of the reactants

Q2 A__________ is the reagent that is completely consumed during a chemical reaction.

limiting reactant

Q3 Which of these is the correct percentage of oxygen in atomsphere ?

0.21

Q4 Which of these is the correct percentage of nitrogen in atomsphere ?

0.7 8

Q5 To determine the percent composition, the amounts of each gas can be measured both by

weight and volume

Q6 A student measuring a gas should be careful of these except ________

molecular moveme nt

Q7 ____________ is a homogeneous mixture of gases such as nitrogen, oxygen, argon, and trace amounts of other elemental gases and carbon dioxide

air

Q8 The total mass of each element in a compound depends on the number of___________

its atoms

Q9 _____________helps identify each constituent element by its chemical symbol and indicates the number of atoms of each element in the compound.

chemical formular

Q10 The atoms in a compound are held together by _____________

chemical bond s.

Q11 ____________ is the simplest way to express information about the atoms that constitute any given chemical compound

empirical formula r

Q12 ____________ may be used to remove any brown stains left on the glassware

Oxalic aci d

Q13 An algebraic decrease in oxidation number or a process in which electrons are gained____________

reduction

Q14 An algebraic increase in oxidation number, or a process in which electrons are lost
________________

oxidation

Q15 __________ leads to coordinate bond formation.

Lewis base

Q16 Valence bond theory (VBT) is introduced to explain the reason for the variation in__________ .

coordination number

Q17 The energy necessary to pair up electron in free metal ion can be easily estimated from the appropriate___________

spectroscopic data

Q18 Crystal field theory provides insight to _____________________

spectra and magnetic properties of complexes through the concept of strong and weak field ligands

Q19 The splitting pattern in 5d is the greatest because _____________

it spread more into space than others.

Q20 Smaller the size of the anions in crystal field theory results in____________

greater splittin g




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Adebisi
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Re: NOUN TMA Questions and Answers: CHM423- Coordination Chemistry

Postby Adebisi » Thu Jan 31, 2019 5:35 am

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Q21 No symmetry symbol is required to describe the bond in tetrahedral field because there is

no centre of symmetry in a tetrahedral structure.

Q22 _____________ is the result of overlap of bonding atomic orbital of the ligands and the hybridized orbital of the metal leading to formation of both bonding and antibonding molecular orbitals

Molecular orbital theory

Q23 ___________ are derived from electronic spectra of complexes

Racah parameters

Q24 What is the full meaning of LUMO?

Lowest unoccupied Molecular Orbi tal

Q25 The higher the oxidation state or the primary valence of the metal in crystal field results in

greater spli tting.

Q26 A square planar arrangement of ligands can be obtained from_______________________________

octahedral model by removal of the two ligands point directly along the z axis.

Q27 All complexes are octahedral and have six ligands bonded to the metal ion.

always false

Q28 The energy separating the triply degenerate and doubly degenerate set of orbitals is called

crystal splittin g

Q29 CFT predicts properties of complexes based on_________________________________

repulsion between electrons of the metal and those of the ligands in a complex .

Q30 The crystal splitting_____________

depends on the nature of the ligand
determines the energy required for an electron to be promoted from the lower energy level or orbital to the
higher energy level
it is represented as 10 Dq
---all of these

Q31 _________states that any non linear molecular system in a degenerate electronic state will be unstable and will undergo some sort of geometrical distortion to lower its symmetry and remove the degeneracy.

Jahn Teller theory

Q32 Ligands that give high-spin octahedral complexes with first-row metal ion are known as

weak field ligands

Q33 Ligands that give low-spin octahedral complexes with first-row metal ionsare
called___________________

strong field ligands

Q34 Ligands that force electron pairing are known as____________

strong field ligands

Q35 The series of ligands arranged intheir order of field strength is called _____________ of the ligands.

the spectrochemical series

Q36 The positions of the absorption bands in the preparation of complexes will be shifted to higher or lower wave numbers depending on______________

the nature of the ligand

Q37 The preparation of several complexes of the same metal ion and the same coordination number are done by__________________

using different ligands .

Q38 The number and type of absorption bands observed in the spectra of complexes is most successfully explained by ___________ .

crystal field theor y

Q39 Valence bond theory can explain colours and spectra of complexes

Not True

Q40 Valence bond theory cannot explain relative stability of complexes.

Absolute TRUE




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Adebisi
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Re: NOUN TMA Questions and Answers: CHM423- Coordination Chemistry

Postby Adebisi » Thu Jan 31, 2019 5:36 am

Email: Solutions2tma@gmail.com
Whatsapp: 08155572788

Q41 Valence bond theory (VBT) is introduced to explain the reason for the variation in__________ .

coordination number

Q42 The EAN rule states that stable compound should have electronic configuration of its
nearest___________.

noble ga s

Q43 Silver complexes have coordination number __________

two

Q44 ____________valency influences the geometry of complexes

seconda ry

Q45 Anions satifies ___________ valency

primary

Q46 Complexes possessed________ kinds of valencies

two

Q47 ____________ contribution provided information on the unique characteristics of coordination compounds

Werne r􀳦??s

Q48 Metals such as Gold and Nickel can be purified by ______________.

complexation reaction

Q49 Coordination compounds are employed in quantitative and qualitative analyses of metals.

Correct

Q50 __________ type of ligands have two heteroatoms and any can be used to coordinate to metal depending on the reaction conditions.

ambidentate

Q51 Diethylenetriamine is an example of ________________ ligand

Tridentate

Q52 Bidentate ligands has_________ binding sites

two

Q53 Ligands can be group into different classes based on_________________

the number of donor atoms

Q54 A compound is also referred to as complex because on ionization, it exists as___________,

an independent species without dissoc iation

Q55 __________ leads to coordinate bond formation.

Lewis base

Q56 A molecule can function as a Lewis base provided it has ___________ with lone pair(s) on them

heteroatom( s)

Q57 Lewis acid must have________________ suitable orbitals to accommodate the donated electron pairs

empty

Q58 Electron pair donors are ____________________.

Lewis bases

Q59 Electron pair acceptors are_______________________.

Lewis acids

Q60 The knowledge of_____________ has provided insight into the mode of kinetics and mechanisms of biological molecules in living systems.

coordination chemi stry


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Adebisi
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Re: NOUN TMA Questions and Answers: CHM423- Coordination Chemistry

Postby Adebisi » Thu Jan 31, 2019 5:38 am

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Q61 Which of these is not a factor that affects crystal field splitting

the degree of covalency

Q62 One of these is not a bending vibrational mode in organic molecules

Asymmetry

Q63 Which of these is not a type of magnetic behaviors?

bimagnetism

Q64 Information on why complexes with the same chemical formula differ in physical and chemical properties is provided by;

Isomerism

Q65 One of these isomerism is possible in tetrahedral and octahedral (cis-isomer) with no centre of symmetry complexes

optical

Q66 Which of these types of isomerism is possible in square planar and octahedral complexes?

geometrical isomerisms

Q67 Isomers that are not superimposable on their mirror images are____________

optical isomerism

Q68 Optical isomerism and geometric isomerism are types of one of the following

stereoisomerism

Q69 There are ________ types of structural isomerism.

6

Q70 All these are methods of preparation of complexes except;

reaction of m etals

Q71 __________isomers contain pairs of ionic complexes that exchange ligands with each other.

coordination isomer

Q72 Ionization isomers give different __________in aqueous solution.

ions

Q73 ___________is known as constitutional isomers.

Structural isomers

Q74 __________ differ in the spatial arrangement of ligands round the central metal.

Stereoisomers

Q75 ___________ differ in the way ligands or donor atoms of ligands are arranged round a central metal.

Structural isomers

Q76 ____________ is a phenomenon used to describe complexes with the same molecular weight and molecular formula but different structural and/or spatial arrangement of donor atoms around the central metal in the coordination sphere.

isomerism

Q77 Diethylenetriamine is an example of ________________ ligand

Tridentate

Q78 Bidentate ligands has_________ binding sites

two

Q79 Ligands can be group into different classes based on_________________

the number of donor atoms

Q80 A compound is also referred to as complex because on ionization, it exists as___________,

an independent species without dissoc iation



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