Question 1

Scandium is one of the few transition elements to show a single oxidation state in its compounds where it occurs as a __ ion.

Accepted Answer

3+

Question 2

The name of the coordination compound K4[Fe(CN)6] is _________ ____________________

Accepted Answer

Potassium hexacyanoferrate(II)

Question 3

In which of the following dn configurations in an octahedral field, would the pairing energy need to be considered to predict whether the ion would be low or high spin?

Accepted Answer

A)  d3 
B)  d5 
C)  d1 
D)  d9 
A)  d3 
B)  d5 
C)  d1 
D)  d9 C

Question 4

Match the following ions with the appropriate expression for their CFSE in terms of ΔS1U1B1oS1U1B0 (crystal field splitting) and P (pairing energy).
-[Fe(H2O)6]4+(high spin)

Accepted Answer

A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo 
A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo

Question 5

Crystal field theory predicts that the dx2-y2 orbital is highest in energy in a square pyramid.

Accepted Answer

A) True 
 B)False

Question 6

Match the following ions with the appropriate expression for their CFSE in terms of ΔS1U1B1oS1U1B0 (crystal field splitting) and P (pairing energy).
-[Co(H2O)6]3+ (high spin)

Accepted Answer

A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo 
A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo

Question 7

The compound with the formula [CoCl(H2O)5]Cl2 can exhibit which of the following types of isomerism? Please select all that apply.

Accepted Answer

A)  Linkage isomerism 
B)  Optical isomerism 
C)  Structural isomerism 
D)  Hydration isomerism 
A)  Linkage isomerism 
B)  Optical isomerism 
C)  Structural isomerism 
D)  Hydration isomerism

Question 8

Match the metal complex with the intensity of transition observed for a solution of that complex.
-[MnO4]-

Accepted Answer

A)  0.01 m2 mol-1  
B)  50 m2 mol-1  
C)  1 m2 mol-1 
D)  200 m2 mol-1 
A)  0.01 m2 mol-1  
B)  50 m2 mol-1  
C)  1 m2 mol-1 
D)  200 m2 mol-1

Question 9

Match the denticity to the ligand.
-Water

Accepted Answer

A)  tridentate 
B)  bidentate 
C)  monodentate 
D)  hexadentate 
A)  tridentate 
B)  bidentate 
C)  monodentate 
D)  hexadentate

Question 10

Match the metal complex with the intensity of transition observed for a solution of that complex.
-[CoCl4]2-

Accepted Answer

A)  0.01 m2 mol-1  
B)  50 m2 mol-1  
C)  1 m2 mol-1 
D)  200 m2 mol-1 
A)  0.01 m2 mol-1  
B)  50 m2 mol-1  
C)  1 m2 mol-1 
D)  200 m2 mol-1

Question 11

Match the following ions with the appropriate expression for their CFSE in terms of ΔS1U1B1oS1U1B0 (crystal field splitting) and P (pairing energy).
-[Co(H2O)6]3+ (low spin)

Accepted Answer

A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo 
A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo

Question 12

The compound with the formula [CoCl2(en)2] has three possible isomers.

Accepted Answer

A) True 
 B)False

Question 13

Tetrahedral complexes are normally high spin.

Accepted Answer

A) True 
 B)False

Question 14

Match the denticity to the ligand.
-C2O42-

Accepted Answer

A)  tridentate 
B)  bidentate 
C)  monodentate 
D)  hexadentate 
A)  tridentate 
B)  bidentate 
C)  monodentate 
D)  hexadentate

Question 15

The change in the third ionization energy does not vary smoothly across the first transition series. Why? Please select all that apply.

Accepted Answer

A)  A paired electron is lost when iron is oxidised from 2+ to 3+ 
B)  Iron gains an electron which must be paired. 
C)  Manganese loses an unpaired electron when it is oxidised from 2+ to 3+. 
D)  Manganese gains an electron which must be paired. 
A)  A paired electron is lost when iron is oxidised from 2+ to 3+ 
B)  Iron gains an electron which must be paired. 
C)  Manganese loses an unpaired electron when it is oxidised from 2+ to 3+. 
D)  Manganese gains an electron which must be paired.

Question 16

Match the following ions with the appropriate expression for their CFSE in terms of ΔS1U1B1oS1U1B0 (crystal field splitting) and P (pairing energy).
-[Fe(H2O)6]4+ (low spin)

Accepted Answer

A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo 
A)  -1.6 Δo + P 
B)  -2.4 Δo + 3P 
C)  -0.4 Δo + P 
D)  -0.6 Δo

Question 17

Match the metal complex with the intensity of transition observed for a solution of that complex.
-[Mn(H2O)6]2+

Accepted Answer

A)  0.01 m2 mol-1  
B)  50 m2 mol-1  
C)  1 m2 mol-1 
D)  200 m2 mol-1 
A)  0.01 m2 mol-1  
B)  50 m2 mol-1  
C)  1 m2 mol-1 
D)  200 m2 mol-1

Question 18

The compound cobalt blue (CoAl2O4) absorbs blue light to appear blue.

Accepted Answer

A) True 
 B)False

Question 19

Moving from left to right across the Periodic Table, the atomic radii of the first row transition elements does not show the same trend as the s and p blocks, e.g. from lithium to fluorine. Why?

Accepted Answer

A)  d electrons screen more effectively than s and p electrons, so Zeff falls. 
B)  The increase in the electron-electron repulsion becomes more important as the d orbitals are filled and counteracts the effect of the increase in Zeff. 
C)  d electrons screen less effectively than s and p electrons, so Zeff rises. 
D)  Zeff is unaffected by the increasing number of electrons as d electrons screen so poorly. 
A)  d electrons screen more effectively than s and p electrons, so Zeff falls. 
B)  The increase in the electron-electron repulsion becomes more important as the d orbitals are filled and counteracts the effect of the increase in Zeff. 
C)  d electrons screen less effectively than s and p electrons, so Zeff rises. 
D)  Zeff is unaffected by the increasing number of electrons as d electrons screen so poorly.

Question 20

The formula of the coordination compound hexaaquairon(II) sulfate is___________________________

Accepted Answer

The answer of The formula of the coordination compound hexaaquairon(II)...

Exam 28: D-Block Chemistry

Scandium is one of the few transition elements to show a single oxidation state in its compounds where it occurs as a __ ion.

The name of the coordination compound K4[Fe(CN)6] is _________ ____________________

In which of the following dn configurations in an octahedral field, would the pairing energy need to be considered to predict whether the ion would be low or high spin?

Match the following ions with the appropriate expression for their CFSE in terms of Δo (crystal field splitting) and P (pairing energy). -[Fe(H2O)6]4+(high spin)

Crystal field theory predicts that the dx2-y2 orbital is highest in energy in a square pyramid.

Match the following ions with the appropriate expression for their CFSE in terms of Δo (crystal field splitting) and P (pairing energy). -[Co(H2O)6]3+ (high spin)

The compound with the formula [CoCl(H2O)5]Cl2 can exhibit which of the following types of isomerism? Please select all that apply.

Match the metal complex with the intensity of transition observed for a solution of that complex. -[MnO4]-

Match the denticity to the ligand. -Water

Match the metal complex with the intensity of transition observed for a solution of that complex. -[CoCl4]2-

Match the following ions with the appropriate expression for their CFSE in terms of Δo (crystal field splitting) and P (pairing energy). -[Co(H2O)6]3+ (low spin)

The compound with the formula [CoCl2(en)2] has three possible isomers.

Tetrahedral complexes are normally high spin.

Match the denticity to the ligand. -C2O42-

The change in the third ionization energy does not vary smoothly across the first transition series. Why? Please select all that apply.

Match the following ions with the appropriate expression for their CFSE in terms of Δo (crystal field splitting) and P (pairing energy). -[Fe(H2O)6]4+ (low spin)

Match the metal complex with the intensity of transition observed for a solution of that complex. -[Mn(H2O)6]2+

The compound cobalt blue (CoAl2O4) absorbs blue light to appear blue.

Moving from left to right across the Periodic Table, the atomic radii of the first row transition elements does not show the same trend as the s and p blocks, e.g. from lithium to fluorine. Why?

The formula of the coordination compound hexaaquairon(II) sulfate is___________________________

Fundamentals

The Language of Organic Chemistry

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Filters

The name of the coordination compound K₄[Fe(CN)₆] is _ ____________

In which of the following dⁿ configurations in an octahedral field, would the pairing energy need to be considered to predict whether the ion would be low or high spin?

Match the following ions with the appropriate expression for their CFSE in terms of Δ_o (crystal field splitting) and P (pairing energy). -[Fe(H₂O)₆]⁴⁺(high spin)

Crystal field theory predicts that the d_x²_-_y² orbital is highest in energy in a square pyramid.

Match the following ions with the appropriate expression for their CFSE in terms of Δ_o (crystal field splitting) and P (pairing energy). -[Co(H₂O)₆]³⁺ (high spin)

The compound with the formula [CoCl(H₂O)₅]Cl₂ can exhibit which of the following types of isomerism? Please select all that apply.

Match the metal complex with the intensity of transition observed for a solution of that complex. -[MnO₄]^-

Match the metal complex with the intensity of transition observed for a solution of that complex. -[CoCl₄]^2-

Match the following ions with the appropriate expression for their CFSE in terms of Δ_o (crystal field splitting) and P (pairing energy). -[Co(H₂O)₆]³⁺ (low spin)

The compound with the formula [CoCl₂(en)₂] has three possible isomers.

Match the denticity to the ligand. -C₂O₄^2-

Match the following ions with the appropriate expression for their CFSE in terms of Δ_o (crystal field splitting) and P (pairing energy). -[Fe(H₂O)₆]⁴⁺(low spin)

Match the metal complex with the intensity of transition observed for a solution of that complex. -[Mn(H₂O)₆]²⁺

The compound cobalt blue (CoAl₂O₄) absorbs blue light to appear blue.