Question 1

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. 
A)  2, 0. 
B)  4, 4. 
C)  5, 0. 
D)  4, 2. 
E)  6, 2.

Question 2

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 presented 
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 presented

Question 3

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

Question 4

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)  7 
A)  3 
B)  4 
C)  5 
D)  6 
E)  7

Question 5

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 above 
A)  2 
B)  4 
C)  6 
D)  8 
E)  None of the above

Question 6

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

Accepted Answer

A)  6 
B)  7 
C)  8 
D)  9 
E)  10 
A)  6 
B)  7 
C)  8 
D)  9 
E)  10

Question 7

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 above 
A)  +1 
B)  +2 
C)  +3 
D)  +4 
E)  None of the above

Question 8

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 9

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

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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+ 
A)  [Co(H2O)6]2+ 
B)  [Co(NH3)6]2+ 
C)  [CoF6]4- 
D)  [Co(CN)6]4- 
E)  [Co(en)6]2+

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

Question 14

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 above 
A)  0 
B)  1 
C)  3 
D)  5 
E)  None of the above

Question 15

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. = +3 
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. = +3

Question 16

Which of these ligands produces the strongest crystal field

Accepted Answer

A)  Cl- 
B)  CO 
C)  OH- 
D)  H2O 
E)  NH3 
A)  Cl- 
B)  CO 
C)  OH- 
D)  H2O 
E)  NH3

Question 17

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. 
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.

Question 18

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

Question 19

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

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 23: Transition Metals Chemistry and Coordination Compounds

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

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.

The electron configuration of a Cr3+ ion is

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

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

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

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

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

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

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

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

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

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

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

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]+

Which of these ligands produces the strongest crystal field

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,

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

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

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Filters

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

The electron configuration of a Cr³⁺ ion is

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

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

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

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

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

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

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

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

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]⁺

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,

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