Chapter.28 Test Bank Answers D-Block Chemistry

Chapter 28: d-Block Chemistry

Test Bank

Type: multiple choice question

Title: Chapter 28 Question 01

1) What is the electronic configuration of Cr³⁺?

Section reference: 28.1

a. [Ar] 3d² 4s¹

b. [Ar] 3d³

c. [Ar] 3d¹ 4s²

d. [Ar] 3d⁵

Type: multiple response question

Title: Chapter 28 Question 02

2) Which of the following are common oxidation states of Mn? Please select all that apply.

Section reference: 28.2, Figure 28.7

a. 5+

b. 4+

c. 7+

d. 2+

Type: fill-in-blank

Title: Chapter 28 Question 03

3) Scandium is one of the few transition elements to show a single oxidation state in its compounds where it occurs as a __ ion.

Section reference: 28.2

a. 3+

Type: multiple choice question

Title: Chapter 28 Question 04

4) Moving from left to right across the Periodic Table, the atomic radii of the first row transition elements does not show the same trend as the s and p blocks, e.g. from lithium to fluorine. Why?

Section reference: 28.1Figure 28.2

a. d electrons screen more effectively than s and p electrons, so Z_eff falls.

b. The increase in the electron-electron repulsion becomes more important as the d orbitals are filled and counteracts the effect of the increase in Z_eff.

c. d electrons screen less effectively than s and p electrons, so Z_eff rises.

d. Z_eff is unaffected by the increasing number of electrons as d electrons screen so poorly.

Type: multiple response question

Title: Chapter 28 Question 05

4) The change in the third ionization energy does not vary smoothly across the first transition series. Why? Please select all that apply.

Section reference: 28.1, Figure 28.4

a. A paired electron is lost when iron is oxidised from 2+ to 3+

b. Iron gains an electron which must be paired.

c. Manganese loses an unpaired electron when it is oxidised from 2+ to 3+.

d. Manganese gains an electron which must be paired.

Type: true-false

Title: Chapter 28 Question 06

6) Although a number of copper(I) compounds exist, CuF is unknown True or false?

a. True

Section reference: 28.2

b. False

Section reference: 28.2

Type: matching question

Title: Chapter 28 Question 07

7) Match the denticity to the ligand.

Section reference: 28.3, Table 28.3 and Table 28.4

a. H₂NCH₂NHCH₂NH₂ = tridentate

b. C₂O₄^2– = bidentate

c. Water = monodentate

d. EDTA^4– = hexadentate

Type: true-false

Title: Chapter 28 Question 08

8) The pH of a solution could affect the ability of EDTA to act as a hexadentate ligand. True or false?

a. True

Section reference: 28.3

b. False

Section reference: 28.3

Type: multiple choice question

Title: Chapter 28 Question 09

9) The polydentate ligand, 2,2-bipyridine can form a chelate ring with a metal atom. How many members does the chelate ring have?

Section reference: 28.3, Table 28.4

a. 3

b. 7

c. 4

d. 5

Type: fill-in-blank

Title: Chapter 28 Question 10

10) The name of the coordination compound K₄[Fe(CN)₆] is _________ ____________________

Section reference: 28.3

a. Potassium hexacyanoferrate(II)

Type: fill-in-blank

Title: Chapter 28 Question 11

08) The formula of the coordination compound hexaaquairon(II) sulfate is___________________________

Section reference: 28.3

a. [Fe(H₂O)₆]SO₄

Type: multiple choice question

Title: Chapter 28 Question 12

12) What is the coordination number of iron in the complex [Fe(en)₂Cl₂] ?

Section reference: 28.3

a. 4

b. 5

c. 6

d. 8

Type: multiple response question

Title: Chapter 28 Question 13

13) The compound with the formula [CoCl(H₂O)₅]Cl₂ can exhibit which of the following types of isomerism? Please select all that apply.

Section reference: 28.3

a. Linkage isomerism

b. Optical isomerism

c. Structural isomerism

d. Hydration isomerism

Type: true-false

Title: Chapter 28 Question 14

14) The compound with the formula [CoCl₂(en)₂] has three possible isomers. True or false?

a. True

Section reference: 28.3

b. False

Section reference: 28.3

Type: true-false

Title: Chapter 28 Question 15

15) Crystal field theory predicts that the d_x²_–y² orbital is highest in energy in a square pyramid. True or false?

a. True

Section reference: 28.4

b. False

Section reference: 28.4

Type: multiple choice question

Title: Chapter 28 Question 16

16) Calculate the CFSE for [Mn(H₂O)₆]⁴⁺ in terms of Δ_o?

Section reference: 28.4

a. –0.8Δ_o

b. –0.4Δ_o

c. –1.2Δ_o

d. –1.6Δ_o

Type: multiple choice question

Title: Chapter 28 Question 17

17) In which of the following dⁿ configurations in an octahedral field, would the pairing energy need to be considered to predict whether the ion would be low or high spin?

Section reference: 28.4

a. d³

b. d⁵

c. d¹

d. d⁹

Type: true-false

Title: Chapter 28 Question 18

18) Tetrahedral complexes are normally high spin. True or false?

a. True

Section reference: 28.5

b. False

Section reference: 28.5

Type: true-false

Title: Chapter 28 Question 19

19) The high spin Fe⁴⁺ ion would show a Jahn-Teller distortion in an octahedral field. True or false?

a. True

Section reference: 28.5

b. False

Section reference: 28.5

Type: matching question

Title: Chapter 28 Question 20

20) Match the metal complex with the intensity of transition observed for a solution of that complex.

Section reference: 28.6

a. [Mn(H₂O)₆]²⁺ = 0.01 m² mol^–1

b. [CoCl₄]^2– = 50 m² mol^–1

c. [Co(H₂O)₆]²⁺ = 1 m² mol^–1

d. [MnO₄]^– = 200 m² mol^–1

Type: true-false

Title: Chapter 28 Question 21

21) The compound cobalt blue (CoAl₂O₄) absorbs blue light to appear blue. True or false?

a. True

Section reference: 28.6, Figure 28.36

b. False

Section reference: 28.6, Figure 28.36

Type: multiple choice question

Title: Chapter 28 Question 22

22) Calculate the magnetic moment expected for a compound containing a first-row transition metal with three unpaired electrons.

Section reference: 28.7

a. 1.73 μB

b. 3.87 μB

c. 5.92 μB

d. 4.90 μB

Type: true-false

Title: Chapter 28 Question 23

23) The spin only magnetic moment equation cannot be used to calculate the magnetic moment for second and third row transition metals. True or false?

a. True

Section reference: 28.7

b. False

Section reference: 28.7

Type: multiple choice question

Title: Chapter 28 Question 24

24) The measured magnetic moment of [Ni(SCN)₄]^2– is effectively zero, while the magnetic moment of [NiCl₄]^2– approximates to 2.83 μB. Why?

Section reference: 28.7

a. [Ni(SCN)₄]^2– is low spin and [NiCl₄]^2– is high spin in a tetrahedral ligand field giving different numbers of unpaired electrons.

b. [Ni(SCN)₄]^2– is tetrahedral and [NiCl₄]^2– is square planar.

c. [Ni(SCN)₄]^2– is high spin and [NiCl₄]^2– low spin in a tetrahedral ligand field giving different numbers of unpaired electrons.

d. [Ni(SCN)₄]^2– is square planar and [NiCl₄]^2– is tetrahedral.

Type: matching question

Title: Chapter 28 Question 25

25) Match the following ions with the appropriate expression for their CFSE in terms of Δ_o (crystal field splitting) and P (pairing energy).

Section reference: 28.5, Figure 28.31, Table 28.7

a. [Fe(H₂O)₆]⁴⁺ (low spin) = –1.6 Δ_o + P

b. [Co(H₂O)₆]³⁺ (low spin) = –2.4 Δ_o + 3P

c. [Co(H₂O)₆]³⁺ (high spin) = –0.4 Δ_o + P

d. [Fe(H₂O)₆]⁴⁺(high spin) = –0.6 Δ_o