Question 1

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) None of the above
G) A) and D)

Question 2

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) C) and D)
G) All of the above

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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 5

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) B) and C)
G) A) and B)

Question 6

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 7

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) A) and D)
G) B) and C)

Question 8

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) C) and D)
G) A) and C)

Question 9

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) A) and B)
G) A) and C)

Question 10

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 D)

Question 11

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 E)
G) A) and B)

Question 12

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) None of the above

Question 13

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 E)
G) A) and C)

Question 14

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) C) and D)
G) C) and E)

Question 15

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) B) and D)
G) A) and C)

Question 16

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) A) and C)
G) B) and E)

Question 17

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 18

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

Accepted Answer

Question 19

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

Accepted Answer

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

Question 20

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 D)
G) A) and C)

Exam 22: Coordination Chemistry

Which of the following is a bidentate ligand?

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

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

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

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

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

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

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

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

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

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

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A bidentate ligand always

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

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

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

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