Question 1

Choose the INCORRECT completion of the following sentence:
"The transition elements are typically characterized by....

Accepted Answer

A)  ...their ability to exist in several different oxidation states."
B)  ...poor electrical conductivity."
C)  ...moderate to extreme hardness."
D)  ...the formation of mostly colored compounds."
E)  ...high melting points." B

Question 2

Choose the INCORRECT statement.

Accepted Answer

A)  Titanium is valued for its low density,high structural strength and corrosion resistance.
B)  Titanium chloride is the most widely used white pigment for paints.
C)  Chromium is often used to plate other metals for decorative purposes.
D)  Dichromate is Cr2O72-.
E)  Chromate is CrO42-. B

Question 3

Which of the following elements is likely to have an atomic radius of 124 pm?

Accepted Answer

A)  Fe
B)  Ru
C)  Os
D)  Mo A

Question 4

Choose the INCORRECT statement.

Accepted Answer

A)  Among the methods to separate the lanthanides are fractional precipitation and solvent extraction.
B)  Because the properties of the lanthanides are so similar,separation must be done in a series of repetitive steps.
C)  Lanthanides are reactive metals,that is they liberate H2(g) from acids.
D)  The 4f electrons play a major role in chemical bonding.
E)  The pure lanthanide metals can be produced by electrolytic reduction from the +3 oxidation state.

Question 5

Titanium tetrachloride has replaced white lead as the pigment in white paints.

Accepted Answer

A) True 
 B)False

Question 6

Which element has the largest number of unpaired electrons?

Accepted Answer

A)  Cu2+ 
B)  Fe3+ 
C)  V3+ 
D)  Ni2+ 
E)  Zn2+

Question 7

Choose the INCORRECT statement.

Accepted Answer

A)  The electron configuration of Fe2+ is [Ar]3d6.
B)  The electron configuration of Co2+ is [Ar]3d7.
C)  The electron configuration of Fe3+ is [Ar]3d5.
D)  The electron configuration of Ni2+ is [Ar]3d5.
E)  A metal carbonyl is a compound formed from a metal and carbon monoxide.

Question 8

Transition group elements differ from main group metals in several ways.Which differences of the following are correct?

Accepted Answer

A)  many of the metals and their compounds having catalytic activity
B)  many of the hydrated cations having distinctive colors
C)  most of their compounds having bonds that involve d orbitals
D)  many of the metals being paramagnetic,but none ferromagnetic
E)  most having more than one common oxidation state

Question 9

A 0.535 g sample of pyrolusite ore (impure MnO2)is treated with 1.42 g oxalic acid (H2C2O4 ∙ 2H2O)in an acidic medium.Following this reaction,the excess oxalic acid is titrated with 0.1000 M KMnO4,36.6 mL being required.What is the % MnO2 in the ore? The reactions are:
H2C2O4 ∙ 2 H2O(aq)+ MnO2(s)+ 2 H+(aq)→ Mn2+(aq)+ 4 H2O(l)+ 2 CO2(g) 
 5 H2C2O4 ∙ 2H2O(aq)+ 2 MnO4-(aq)+ 6 H+(aq)→ 2 Mn2+(aq)+ 18 H2O(l)+ 10 CO2(g)

Accepted Answer

A)  34.4%
B)  61.1%
C)  2.33%
D)  1.22%
E)  38.9%

Question 10

Choose the INCORRECT statement about transition elements.

Accepted Answer

A)  Coordination compounds are formed by coordinate covalent bonds.
B)  The metal ions provide empty d orbitals in coordination compounds.
C)  The ligand supplies one or more pairs of electrons that form coordinate bonds in coordination compounds.
D)  Colored compounds and solutions occur because of electronic transitions that occur within partially filled d orbitals.
E)  Paramagnetism is due to paired electrons.

Question 11

Which of the following metals form compounds with the highest oxidation states?

Accepted Answer

A)  V
B)  Ti
C)  Mn
D)  Y
E)  Sc

Question 12

When permanganate ion serves as an oxidizing agent in acidic aqueous solution the manganese-containing product most likely to be formed is ________.

Accepted Answer

A)  Mn2+
B)  MnO2 
C)  MnO4- 
D)  MnO
E)  Mn

Question 13

Choose the INCORRECT statement.

Accepted Answer

A)  Galvanized iron is iron coated with zinc.
B)  Mercury is the only metal that is liquid at 25 °C.
C)  Hatter's disease is a form of mercury poisoning,i.e. ,the Mad Hatter,the friend of Alice.
D)  Brass is an alloy of mostly copper and zinc.
E)  Amalgams are zinc alloys.

Question 14

What volume of carbon monoxide,measured at 1200 °C and 720 Torr,would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO(s)+ C(s)→ Zn(s)+ CO(g)]

Accepted Answer

A)  1.2 × 102 L
B)  1.5 × 103 L
C)  3.5 × 103 L
D)  7.8 × 103 L
E)  7.0 × 1 04 L

Question 15

Choose the INCORRECT statement.

Accepted Answer

A)  The coinage metals are used for coins because of durability and resistance to corrosion.
B)  Bronze is an alloy of copper and tin.
C)  Coinage metals are excellent electrical conductors.
D)  Coinage metals have poor malleability and ductility.
E)  Gold does not react with any acid but aqua regia.

Question 16

The phenomenon resulting from the weakly effective screening of outermost electrons from the nucleus by f subshell electrons,resulting in only small differences in atomic radii in elements of atomic number 58-71,is called the:

Accepted Answer

A)  actinide expansion
B)  f-subshell extension
C)  lanthanide contraction
D)  elemental transition
E)  lattice distortion

Question 17

What average current must be maintained to electroplate 6.5 g of chromium per hour from a solution of chromium(III)complex?

Accepted Answer

A)  3.4 A
B)  6.9 A
C)  10 A
D)  12 A
E)  15 A

Question 18

Write the chemical equation for the reduction of Cr2O3 to chromium with silicon as the reducing agent.

Accepted Answer

A)  Si(s) + Cr2O3(s) → SiO3(s) + Cr(l) 
B)  Si(s) + Cr2O3(s) → SiO2(s) + 2 CrO(s) 
C)  3 Si(s) + 2 Cr2O3(s) → 3 SiO2(s) + 4 Cr(l) 
D)  3 Si(s) + Cr2O3(s) → 3 SiO(s) + 2 Cr(l) 
E)  4 Si(s) + Cr2O3(s) → SiO3(s) + 2 CrO(s)

Question 19

What is the approximate pH of the H+(aq)/H2(g)electrode compartment through which H2 gas is bubbled at a pressure of 1.00 atm if this electrode,when coupled with a Ni(s)/(0.10 M)Ni2+(aq)electrode,forms a galvanic cell having an initial potential of 0.10 V? [The discharge reaction involves oxidation of nickel to Ni2+(aq).]

Accepted Answer

A)  2.15
B)  4.65
C)  6.15
D)  3.15
E)  3.65

Question 20

Which of the following statements is true regarding the oxidation states of the transition elements?

Accepted Answer

A)  For group 8,only Os forms compounds with an oxidation state of +8.
B)  For group 6,Cr forms many compounds with an oxidation state of +6.
C)  The late transition metal elements form many compounds with oxidation states of 0 and -1.
D)  The most common oxidation state of Co is +7.

Exam 23: The Transition Elements

Choose the INCORRECT completion of the following sentence: "The transition elements are typically characterized by....

Choose the INCORRECT statement.

Which of the following elements is likely to have an atomic radius of 124 pm?

Choose the INCORRECT statement.

Titanium tetrachloride has replaced white lead as the pigment in white paints.

Which element has the largest number of unpaired electrons?

Choose the INCORRECT statement.

Transition group elements differ from main group metals in several ways.Which differences of the following are correct?

Choose the INCORRECT statement about transition elements.

Which of the following metals form compounds with the highest oxidation states?

When permanganate ion serves as an oxidizing agent in acidic aqueous solution the manganese-containing product most likely to be formed is ________.

Choose the INCORRECT statement.

What volume of carbon monoxide,measured at 1200 °C and 720 Torr,would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO(s) + C(s) → Zn(s) + CO(g) ]

Choose the INCORRECT statement.

The phenomenon resulting from the weakly effective screening of outermost electrons from the nucleus by f subshell electrons,resulting in only small differences in atomic radii in elements of atomic number 58-71,is called the:

What average current must be maintained to electroplate 6.5 g of chromium per hour from a solution of chromium(III) complex?

Write the chemical equation for the reduction of Cr₂O₃ to chromium with silicon as the reducing agent.

Which of the following statements is true regarding the oxidation states of the transition elements?