Question 1

What is the oxidation number of Co in the complex [Co(H2O) 4Cl2]Cl

Accepted Answer

A)   +1
B)   +2
C)   +3
D)   +4
E)   None of the aboveF) All of the above
G) C) and E)

Question 2

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

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

Question 3

Determine 
(i)  the oxidation number of the metal, 
(ii)  the number of d electrons, 
(iii)  the coordination number, 
(iv)  the charge of the complex ion, and 
(v)  the number and type of ligands for the coordination compound shown below.

Accepted Answer

A)   i = +2; ii = 3 d electrons; iii = 5; iv = 1+; v = zero monodentate and four bidentate
B)   i = +3; ii = 2 d electrons; iii = 6; iv = 1+; v = two monodentate and two bidentate
C)   i = +2; ii = 3 d electrons; iii = 5; iv = 1+; v = two monodentate and one bidentate
D)   i = +3; ii = 3 d electrons; iii = 6; iv = 1+; v = two monodentate and two bidentate
E)   None of the above have all five answers correctly presentedF) A) and B)
G) A) and E)

Question 4

The electron configuration of a Cr3+ ion is

Accepted Answer

A)   [Ar]3d5.
B)   [Ar]4s13d2.
C)   [Ar]3d3.
D)   [Ar]4s13d5.
E)   [Ar]4s23d4.F) B) and D)
G) A) and E)

Question 5

In the complex ion [Fe(CN) 6]4-, the oxidation number of Fe is

Accepted Answer

A)   +1.
B)   +2.
C)   +3.
D)   -4.
E)   +6.F) A) and C)
G) A) and E)

Question 6

Which of these ligands produces the strongest crystal field

Accepted Answer

A)   Cl-
B)   CO
C)   OH-
D)   H2O
E)   NH3F) A) and E)
G) C) and D)

Question 7

Which of these complex ions would absorb light with the longest wavelength

Accepted Answer

A)   [Co(H2O) 6]2+
B)   [Co(NH3) 6]2+
C)   [CoF6]4-
D)   [Co(CN) 6]4-
E)   [Co(en) 6]2+F) A) and B)
G) All of the above

Question 8

The chemical formula of the dibromobis(oxalato)cobaltate(III) ion is:
[CoBr2(C2O4)2]3-

Accepted Answer

A) True 
 B)False

Question 9

The correct name of the complex ion [Co(H2O)4Cl2]+ is:
tetraaquodichlorocobalt(III) ion

Accepted Answer

A) True 
 B)False

Question 10

A molecule or atom that accepts an electron pair to form a coordinate covalent bond is called a Lewis base.

Accepted Answer

A) True 
 B)False

Question 11

In K4[Fe(CN) 6], how many 3d electrons does the iron atom have

Accepted Answer

A)   3
B)   4
C)   5
D)   6
E)   7F) B) and E)
G) None of the above

Question 12

In the coordination compound [Pt(NH3) 2Cl2], the coordination number and oxidation number of the central atom are, respectively,

Accepted Answer

A)   2, 0.
B)   4, 4.
C)   5, 0.
D)   4, 2.
E)   6, 2.F) B) and E)
G) All of the above

Question 13

The correct formula for sodium tetracyanonickelate(II)  ion is:

Accepted Answer

A)   Ni(CN) 4
B)   [Ni(CN) 4]+
C)   [Ni(CN) 4]2+
D)   [Ni(CN) 4]-
E)   [Ni(CN) 4]2-F) C) and D)
G) A) and B)

Question 14

Copper can be separated from iron in the ore chalcopyrite (CuFeS2)  by heating the ore in the presence of oxygen to form copper(I)  sulfide, iron(II)  oxide, and one other product. Complete the following partially balanced equation by deciding both the identity of the missing compound and the number of moles required to balance the equation. (Note, no other coefficients are allowed to be changed.)  
2CuFeS2(s)  + 4O2(g)   →\rarr→ Cu2S(s)  + 2FeO(s)  + _____

Accepted Answer

A)  2SO3(g) 
B)  3SO3(g) 
C)  2SO2(g) 
D)  3SO2(g) 
E)  None of the above F) A) and B)
G) A) and C)

Question 15

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

Question 16

Which response gives the correct coordination number (C.N.)  and oxidation number (O.N.)  of the transition metal atom in [Co(NH3) 2(H2O) 2Cl2]+

Accepted Answer

A)   C.N. = 2; O.N. = +3
B)   C.N. = 3; O.N. = +1
C)   C.N. = 4; O.N. = +2
D)   C.N. = 6; O.N. = +1
E)   C.N. = 6; O.N. = +3F) All of the above
G) C) and D)

Question 17

In Na3[Ni(SCN) 5], how many 3d electrons does nickel have

Accepted Answer

A)   6
B)   7
C)   8
D)   9
E)   10F) A) and C)
G) C) and D)

Question 18

The oxidation number of Co in [Co(NH3)4Cl2]Cl is +1.

Accepted Answer

A) True 
 B)False

Question 19

What is the coordination number of chromium in Cr(en) 2Cl2

Accepted Answer

A)   2
B)   4
C)   6
D)   8
E)   None of the aboveF) C) and D)
G) B) and D)

Question 20

Predict the number of unpaired electrons in the [Fe(CN) 6]3- ion.

Accepted Answer

A)   0
B)   1
C)   3
D)   5
E)   None of the aboveF) A) and B)
G) A) and C)

Exam 23: Transition Metals Chemistry and Coordination Compounds

In K₄[Fe(CN) ₆], how many 3d electrons does the iron atom have

Correct Answer
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In the complex ion [Fe(CN) ₆]^4-, the oxidation number of Fe is

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

Correct Answer
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The correct name of the complex ion [Co(H₂O)₄Cl₂]⁺ is: tetraaquodichlorocobalt(III) ion

Correct Answer
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Which of these complex ions would absorb light with the longest wavelength

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

Correct Answer
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Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH₃) ₂(H₂O) ₂Cl₂]⁺

Correct Answer
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Predict the number of unpaired electrons in the [Fe(CN) ₆]^3- ion.

Correct Answer
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The chemical formula of the dibromobis(oxalato)cobaltate(III) ion is: [CoBr₂(C₂O₄)₂]^3-

Correct Answer
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The electron configuration of a Cr³⁺ ion is

Correct Answer
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In Na₃[Ni(SCN) ₅], how many 3d electrons does nickel have

Correct Answer
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What is the oxidation number of Co in the complex [Co(H₂O) ₄Cl₂]Cl

Correct Answer
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Determine (i) the oxidation number of the metal, (ii) the number of d electrons, (iii) the coordination number, (iv) the charge of the complex ion, and (v) the number and type of ligands for the coordination compound shown below.

Correct Answer
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What is the coordination number of chromium in Cr(en) ₂Cl₂

Correct Answer
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In the coordination compound [Pt(NH₃) ₂Cl₂], the coordination number and oxidation number of the central atom are, respectively,

Correct Answer
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Which of these ligands produces the strongest crystal field

Correct Answer
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The oxidation number of Co in [Co(NH₃)₄Cl₂]Cl is +1.

Correct Answer
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A molecule or atom that accepts an electron pair to form a coordinate covalent bond is called a Lewis base.

Correct Answer
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The correct formula for sodium tetracyanonickelate(II) ion is:

Correct Answer
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Exam 23: Transition Metals Chemistry and Coordination Compounds

In K4[Fe(CN) 6], how many 3d electrons does the iron atom have

Correct AnswerverifiedShow Answer

In the complex ion [Fe(CN) 6]4-, the oxidation number of Fe is

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

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Correct AnswerverifiedShow Answer

The correct name of the complex ion [Co(H2O)4Cl2]+ is: tetraaquodichlorocobalt(III) ion

Correct AnswerverifiedShow Answer

Which of these complex ions would absorb light with the longest wavelength

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

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Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH3) 2(H2O) 2Cl2]+

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Predict the number of unpaired electrons in the [Fe(CN) 6]3- ion.

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The chemical formula of the dibromobis(oxalato)cobaltate(III) ion is: [CoBr2(C2O4)2]3-

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The electron configuration of a Cr3+ ion is

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In Na3[Ni(SCN) 5], how many 3d electrons does nickel have

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What is the oxidation number of Co in the complex [Co(H2O) 4Cl2]Cl

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Determine (i) the oxidation number of the metal, (ii) the number of d electrons, (iii) the coordination number, (iv) the charge of the complex ion, and (v) the number and type of ligands for the coordination compound shown below.

Correct AnswerverifiedShow Answer

What is the coordination number of chromium in Cr(en) 2Cl2

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In the coordination compound [Pt(NH3) 2Cl2], the coordination number and oxidation number of the central atom are, respectively,

Correct AnswerverifiedShow Answer

Which of these ligands produces the strongest crystal field

Correct AnswerverifiedShow Answer

The oxidation number of Co in [Co(NH3)4Cl2]Cl is +1.

Correct AnswerverifiedShow Answer

A molecule or atom that accepts an electron pair to form a coordinate covalent bond is called a Lewis base.

Correct AnswerverifiedShow Answer

The correct formula for sodium tetracyanonickelate(II) ion is:

Correct AnswerverifiedShow Answer

In K₄[Fe(CN) ₆], how many 3d electrons does the iron atom have

Correct Answer
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In the complex ion [Fe(CN) ₆]^4-, the oxidation number of Fe is

Correct Answer
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Correct Answer
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Correct Answer
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The correct name of the complex ion [Co(H₂O)₄Cl₂]⁺ is: tetraaquodichlorocobalt(III) ion

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

Correct Answer
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Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH₃) ₂(H₂O) ₂Cl₂]⁺

Correct Answer
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Predict the number of unpaired electrons in the [Fe(CN) ₆]^3- ion.

Correct Answer
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The chemical formula of the dibromobis(oxalato)cobaltate(III) ion is: [CoBr₂(C₂O₄)₂]^3-

Correct Answer
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The electron configuration of a Cr³⁺ ion is

Correct Answer
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In Na₃[Ni(SCN) ₅], how many 3d electrons does nickel have

Correct Answer
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What is the oxidation number of Co in the complex [Co(H₂O) ₄Cl₂]Cl

Correct Answer
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Correct Answer
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What is the coordination number of chromium in Cr(en) ₂Cl₂

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In the coordination compound [Pt(NH₃) ₂Cl₂], the coordination number and oxidation number of the central atom are, respectively,

Correct Answer
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Correct Answer
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The oxidation number of Co in [Co(NH₃)₄Cl₂]Cl is +1.

Correct Answer
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Correct Answer
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Correct Answer
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