Question 1

How many unpaired electrons are found in each of the following complex ions?
-[Ni(CN)6]4-

Accepted Answer

2

Question 2

How many unpaired electrons are found in each of the following complex ions?
-[Co(NH3) 4]2+

Accepted Answer

Question 3

Here are some crystal field representations of d electrons in an octahedral complex:
I)  4Fe(CN) 6 A) representation I B) representation II C) representation III D) representation IV E) representation V" class="answers-bank-image d-inline" rel="preload" > II)  4Fe(CN) 6 A) representation I B) representation II C) representation III D) representation IV E) representation V" class="answers-bank-image d-inline" rel="preload" > III)  4Fe(CN) 6 A) representation I B) representation II C) representation III D) representation IV E) representation V" class="answers-bank-image d-inline" rel="preload" > IV)  4Fe(CN) 6 A) representation I B) representation II C) representation III D) representation IV E) representation V" class="answers-bank-image d-inline" rel="preload" > V)  4Fe(CN) 6 A) representation I B) representation II C) representation III D) representation IV E) representation V" class="answers-bank-image d-inline" rel="preload" > Choose the representation that fits the transition metal atom in the following species:
-K4Fe(CN) 6

Accepted Answer

A)  representation I
B)  representation II
C)  representation III
D)  representation IV
E)  representation VF) I) and B)
G) I) and C)

Question 4

True or false: Transition metals show great similarities both within a given period and within a given vertical group.

Accepted Answer

A) True 
 B)False

Question 5

A complex ion is a charged species consisting of a metal ion surrounded by

Accepted Answer

A)  other transition metals
B)  hydrogen ions
C)  ligands
D)  ligands and counter ions
E)  none of theseF) A) and B)
G) A) and C)

Question 6

Which model(s) accounts for the magnetism and color of coordination compounds?
I.Lewis model
II.localized electron model
III.crystal field model

Accepted Answer

A)  I
B)  II
C)  III
D)  I,II
E)  none accounts for both phenomenaF) D) and E)
G) B) and D)

Question 7

Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions.Based on this information,predict the number of unpaired electrons in CoF64-.

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4F) A) and E)
G) None of the above

Question 8

The color of a transition metal complex results from:

Accepted Answer

A)  bending vibrations
B)  stretching vibrations
C)  transition of an electron between d orbitals
D)  transition of an electron between an s and a p orbital
E)  nuclear magnetic resonanceF) B) and E)
G) A) and B) C

Question 9

Co2+ in water is blue.

Accepted Answer

A) True 
 B)False  False

Question 10

Which of the following complexes would be diamagnetic (all electrons paired) ? Assume the strong-field case for all complexes.

Accepted Answer

A)  [Ni(CN) 6]4-
B)  [Ti(CN) 6]3-
C)  [Co(CN) 6]3-
D)  [Cr(CN) 6]3-
E)  none of theseF) C) and D)
G) B) and C)

Question 11

Name the careful heat treatment of metals that provides the proper combination of strength without too much brittleness.

Accepted Answer

A)  tempering
B)  core hardening
C)  fire polishing
D)  blast furnace
E)  direct reductionF) A) and C)
G) A) and E)

Question 12

Why do transition metals show a lot of chemical similarities within a given period?

Accepted Answer

A)  The valence s and p electrons affect their chemistry more so than the inner d and f electrons,which do not participate in bonding as easily.
B)  The number of electrons within a given period varies only slightly and is sometimes identical because these metals have more than one ionic form.
C)  All elements in a given period,including the representative elements,have a lot of chemical similarities due to the gradual increase in atomic number.
D)  The transition metals always fill their s and p orbitals first before filling their d orbitals,which affects their chemistry.
E)  None of the above is correct.F) B) and E)
G) A) and E)

Question 13

The coordination theory was proposed by:

Accepted Answer

A)  Bailar
B)  Jorgensen
C)  Blomstrand
D)  Werner
E)  none of theseF) B) and E)
G) D) and E)

Question 14

When the body adapts to high altitudes,it makes more __________ to adapt to lower oxygen concentrations in the blood.

Accepted Answer

A)  myoglobin
B)  iron
C)  protein
D)  hemoglobin
E)  fatty tissueF) B) and D)
G) B) and C)

Question 15

How many unpaired electrons are there in a complex ion having a d5 electron configuration and an octahedral geometry in the weak field case?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) C) and E)
G) D) and E)

Question 16

Mn(H2O) 43+ (tetrahedral)

Accepted Answer

A)  0
B)  1
C)  2
D)  4
E)  5F) A) and E)
G) A) and C)

Question 17

Copper(I)complexes would be expected to be colorless.

Accepted Answer

A) True 
 B)False

Question 18

A metal ion in a high-spin octahedral complex has two more unpaired electrons than the same ion does in a low-spin octahedral complex.The metal ion could be:

Accepted Answer

A)  V2+
B)  Cu2+
C)  Mn2+
D)  Cr3+
E)  Co2+F) A) and B)
G) A) and C)

Question 19

The transition metal __________ assists insulin in the control of blood sugar and may also be involved in the control of cholesterol.

Accepted Answer

A)  scandium
B)  titanium
C)  iron
D)  nickel
E)  chromiumF) A) and C)
G) B) and E)

Question 20

Which of the following statements concerning the complex ion Co(en) 2Cl2+ is true? (en = ethylenediamine,NH2CH2CH2NH2) ?

Accepted Answer

A)  The complex ion contains Co(I) .
B)  The complex ion exhibits cis and trans geometrical isomers,but no optical isomers.
C)  The complex ion exhibits two geometrical isomers (cis and trans) and two optical isomers.
D)  Since en is a strong field ligand (large  Δ\DeltaΔ ) ,the complex ion is paramagnetic.
E)  The geometric isomers of the complex ion have identical chemical properties. F) A) and C)
G) A) and D)

Exam 21: Transition Metals and Coordination Chemistry

How many unpaired electrons are found in each of the following complex ions? -[Ni(CN)6]4-

Correct Answerverified2

How many unpaired electrons are found in each of the following complex ions? -[Co(NH3) 4]2+

Correct AnswerverifiedShow Answer

Here are some crystal field representations of d electrons in an octahedral complex: I) II) III) IV) V) Choose the representation that fits the transition metal atom in the following species: -K4Fe(CN) 6

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True or false: Transition metals show great similarities both within a given period and within a given vertical group.

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A complex ion is a charged species consisting of a metal ion surrounded by

Correct AnswerverifiedShow Answer

Which model(s) accounts for the magnetism and color of coordination compounds? I.Lewis model II.localized electron model III.crystal field model

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Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions.Based on this information,predict the number of unpaired electrons in CoF64-.

Correct AnswerverifiedShow Answer

The color of a transition metal complex results from:

Correct AnswerverifiedC

Co2+ in water is blue.

Correct AnswerverifiedFalse

Which of the following complexes would be diamagnetic (all electrons paired) ? Assume the strong-field case for all complexes.

Correct AnswerverifiedShow Answer

Name the careful heat treatment of metals that provides the proper combination of strength without too much brittleness.

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Why do transition metals show a lot of chemical similarities within a given period?

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The coordination theory was proposed by:

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When the body adapts to high altitudes,it makes more __________ to adapt to lower oxygen concentrations in the blood.

Correct AnswerverifiedShow Answer

How many unpaired electrons are there in a complex ion having a d5 electron configuration and an octahedral geometry in the weak field case?

Correct AnswerverifiedShow Answer

Mn(H2O) 43+ (tetrahedral)

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Copper(I)complexes would be expected to be colorless.

Correct AnswerverifiedShow Answer

A metal ion in a high-spin octahedral complex has two more unpaired electrons than the same ion does in a low-spin octahedral complex.The metal ion could be:

Correct AnswerverifiedShow Answer

The transition metal __________ assists insulin in the control of blood sugar and may also be involved in the control of cholesterol.

Correct AnswerverifiedShow Answer

Which of the following statements concerning the complex ion Co(en) 2Cl2+ is true? (en = ethylenediamine,NH2CH2CH2NH2) ?

Correct AnswerverifiedShow Answer

How many unpaired electrons are found in each of the following complex ions? -[Ni(CN)₆]⁴^-

Correct Answer
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How many unpaired electrons are found in each of the following complex ions? -[Co(NH₃)₄]²⁺

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Here are some crystal field representations of d electrons in an octahedral complex: I) II) III) IV) V) Choose the representation that fits the transition metal atom in the following species: -K₄Fe(CN) ₆

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Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions.Based on this information,predict the number of unpaired electrons in CoF₆⁴^-.

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C

Co²⁺ in water is blue.

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False

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How many unpaired electrons are there in a complex ion having a d⁵ electron configuration and an octahedral geometry in the weak field case?

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Mn(H₂O) ₄³⁺ (tetrahedral)

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Which of the following statements concerning the complex ion Co(en) ₂Cl₂⁺ is true? (en = ethylenediamine,NH₂CH₂CH₂NH₂) ?

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