Question 1

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y.  Which, if any, of the following pairs are optical isomers?

Accepted Answer

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

Question 2

Which of the following octahedral complexes should have the largest crystal field splitting energy, Δ?

Accepted Answer

A)   [Cr(H2O) 6]3+
B)   [Cr(SCN) 6]3
C)   [Cr(NH3) 6]3+
D)   [Cr(CN) 6]3-
E)   [Cr(en) 3]3+ (en = ethylenediamine) F) A) and E)
G) B) and E)

Question 3

Which of the following ions could exist in only the high-spin state in an octahedral complex?

Accepted Answer

A)   Cr2+
B)   Mn4+
C)   Fe3+
D)   Co3+
E)   Ni2+F) A) and C)
G) B) and C)

Question 4

The systematic name of the coordination compound K2[Co(H2O)2I4] is potassium diaquotetraiodocobaltate(II).

Accepted Answer

A) True 
 B)False

Question 5

How many 4d electrons does a ground-state Ag+ ion have?

Accepted Answer

A)   8
B)   1
C)   10
D)   2
E)   9F) A) and E)
G) A) and C)

Question 6

Consider the following structures (1 and 2 are octahedral; 3 and 4 are square planar) .  Which one of the following statements about the above structures is correct?

Accepted Answer

A)   Structures 1 and 2 are superimposable.
B)   Structures 1 and 2 are geometric isomers.
C)   Structures 3 and 4 are structural isomers.
D)   Structures 3 and 4 are optical isomers.
E)   Structures 3 and 4 are geometric isomers.F) B) and C)
G) C) and E)

Question 7

In a reaction between a metal ion and a group of anions or a polar molecule, the metal ion acts as a ________ ________.

Accepted Answer

The answer of In a reaction between a metal ion...

Question 8

What is the name that refers to the number of donor atoms surrounding the central metal atom in a complex ion?

Accepted Answer

A)   Donor number
B)   Coordination number
C)   Metal number
D)   Metal-donor ratio
E)   Acceptor numberF) C) and D)
G) C) and E)

Question 9

Which of the following is a bidentate ligand?

Accepted Answer

A)   cyanide ion
B)   nitrite ion
C)   ammonia
D)   thiocyanate ion
E)   ethylenediamineF) A) and E)
G) A) and B)

Question 10

A bidentate ligand always

Accepted Answer

A)   forms bonds to two metal ions.
B)   has a charge of 2+ or 2-.
C)   forms complex ions with a charge of 2+ or 2-.
D)   has two donor atoms.
E)   has medical uses.F) C) and D)
G) A) and E)

Question 11

What name is given to the species that has the ability to hold the metal atom, in the complex ion, like a claw?

Accepted Answer

A)   Claw complex
B)   Grasp agent
C)   Chelating agent
D)   Clutch ligand
E)   Clasp a ligandF) C) and E)
G) A) and B)

Question 12

The following energy-level diagram could correspond to which coordination compound?

Accepted Answer

A)   hexabromomanganate(II) 
B)   hexacyanoferrate(II) 
C)   hexacyanoferrate(III) 
D)   hexabromomanganate(IV) 
E)   hexachlorochromate(II) F) A) and C)
G) A) and E)

Question 13

In complexes of transition metals, the maximum coordination number of the metal is equal to its number of d electrons.

Accepted Answer

A) True 
 B)False

Question 14

How many unpaired electrons are there in the complex ion [Mn(CN) 6]3-?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   5F) C) and D)
G) A) and D)

Question 15

In the complex ion [Co(en) 2Br2]+, what is the oxidation number of Co?

Accepted Answer

A)   +1
B)   +2
C)   +3
D)   -2
E)   -1F) B) and C)
G) B) and E)

Question 16

The atom in a ligand that is bound directly to the metal atom is known as the ________ ________.

Accepted Answer

The answer of The atom in a ligand that is...

Question 17

In the coordination compound [Cr(NH3) 2(en) Cl2]Br2, the coordination number (C.N.)  and oxidation number (O.N.)  of the metal atom, respectively, are

Accepted Answer

A)   C.N. = 6; O.N. = +4.
B)   C.N. = 6; O.N. = +3.
C)   C.N. = 5; O.N. = +2.
D)   C.N. = 5; O.N. = +4.
E)   C.N. = 4; O.N. = +3.F) B) and C)
G) A) and E)

Question 18

What is the oxidation number of Fe in [Fe(CN)6]4-?

Accepted Answer

Question 19

The net rotation of plane-polarized light by a racemic mixture is ________.

Accepted Answer

A)   to the right
B)   to the left
C)   zeroD) All of the above
E) B) and C)

Question 20

Which of these square planar complex ions can have cis-trans isomers?

Accepted Answer

A)   [Pt(NH3) 4]2+
B)   [Ni(NH3) 4]2+
C)   [Pt(NH3) 2Cl2]
D)   [Pt(NH3) Cl3]-
E)   [Ni(NH3) 3Cl]+F) A) and E)
G) A) and B)

Exam 22: Coordination Chemistry

The net rotation of plane-polarized light by a racemic mixture is ________.

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Which of these square planar complex ions can have cis-trans isomers?

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The systematic name of the coordination compound K2[Co(H2O)2I4] is potassium diaquotetraiodocobaltate(II).

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Which of the following ions could exist in only the high-spin state in an octahedral complex?

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Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which, if any, of the following pairs are optical isomers?

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In complexes of transition metals, the maximum coordination number of the metal is equal to its number of d electrons.

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Which of the following is a bidentate ligand?

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How many unpaired electrons are there in the complex ion [Mn(CN) 6]3-?

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Which of the following octahedral complexes should have the largest crystal field splitting energy, Δ?

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A bidentate ligand always

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In a reaction between a metal ion and a group of anions or a polar molecule, the metal ion acts as a ________ ________.

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What is the oxidation number of Fe in [Fe(CN)6]4-?

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What name is given to the species that has the ability to hold the metal atom, in the complex ion, like a claw?

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How many 4d electrons does a ground-state Ag+ ion have?

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The following energy-level diagram could correspond to which coordination compound?

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What is the name that refers to the number of donor atoms surrounding the central metal atom in a complex ion?

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In the coordination compound [Cr(NH3) 2(en) Cl2]Br2, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively, are

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In the complex ion [Co(en) 2Br2]+, what is the oxidation number of Co?

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Consider the following structures (1 and 2 are octahedral; 3 and 4 are square planar) . Which one of the following statements about the above structures is correct?

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The atom in a ligand that is bound directly to the metal atom is known as the ________ ________.

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The systematic name of the coordination compound K₂[Co(H₂O)₂I₄] is potassium diaquotetraiodocobaltate(II).

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How many unpaired electrons are there in the complex ion [Mn(CN) ₆]^3-?

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In a reaction between a metal ion and a group of anions or a polar molecule, the metal ion acts as a .

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What is the oxidation number of Fe in [Fe(CN)₆]^4-?

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How many 4d electrons does a ground-state Ag⁺ ion have?

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In the coordination compound [Cr(NH₃) ₂(en) Cl₂]Br₂, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively, are

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In the complex ion [Co(en) ₂Br₂]⁺, what is the oxidation number of Co?

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The atom in a ligand that is bound directly to the metal atom is known as the .

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