Question 1

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y.  Which one, if any, of the following is a pair of optical isomers?

Accepted Answer

A)   1 and 2
B)   1 and 3
C)   1 and 4
D)   3 and 4
E)   None of these choices is correct.F) A) and B)
G) A) and D)

Question 2

In the spectrochemical series, which one of the following ligands has the strongest field?

Accepted Answer

A)   H2O
B)   CN¯
C)   NH3
D)   OH¯
E)   Cl¯F) A) and D)
G) A) and B)

Question 3

Which of the following will be the strongest oxidizing agent?

Accepted Answer

A)   Cr
B)   Cr(II) 
C)   Cr(III) 
D)   Cr(IV) 
E)   Cr(VI) F) A) and B)
G) All of the above

Question 4

How many unpaired electrons are there in the Fe3+ ion?

Accepted Answer

A)   5
B)   4
C)   3
D)   2
E)   1F) B) and E)
G) B) and C)

Question 5

Write the formula for sodium tetracyanonickelate(II) .

Accepted Answer

A)   Na[Ni(CN) 4]
B)   Na[Ni(CN) 4]2
C)   Na2[Ni(CN) 4]
D)   Na4[Ni(CN) 4]
E)   None of these choices is correct.F) A) and B)
G) B) and D)

Question 6

Which of the following ions is most likely to form colored compounds?

Accepted Answer

A)   Sc3+
B)   Cu+
C)   Zn2+
D)   Cr3+
E)   Ca2+F) D) and E)
G) B) and D)

Question 7

The ground state electronic configuration of Cr2+ is:

Accepted Answer

A)   [Ar]4s13d5
B)   [Ar]4s23d4
C)   [Ar]3d4
D)   [Ar]4s13d3
E)   [Ar]4s23d2F) A) and B)
G) A) and C)

Question 8

What is the highest possible oxidation state for molybdenum, Mo?

Accepted Answer

A)   +2
B)   +4
C)   +6
D)   +8
E)   None of these choices is correct.F) A) and D)
G) A) and E)

Question 9

According to Valence Bond theory, in the square planar Ni(CN) 42¯ complex ion, the orbital hybridization pattern is:

Accepted Answer

A)   sp3
B)   dsp2
C)   d2sp
D)   d2sp3
E)   None of these choices is correct.F) A) and E)
G) B) and C)

Question 10

The most common oxidation state for ions of the transition elements is:

Accepted Answer

A)   +2
B)   +3
C)   +4
D)   +5
E)   +6F) None of the above
G) B) and C)

Question 11

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

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

Question 12

In the formation of a transition metal complex, the central metal atom or ion acts as

Accepted Answer

A)   an Arrhenius acid.
B)   a Brønsted-Lowry acid.
C)   a Brønsted-Lowry base.
D)   a Lewis acid.
E)   a Lewis base.F) A) and C)
G) B) and E)

Question 13

A characteristic of ligands is that

Accepted Answer

A)   they are Lewis acids.
B)   they are Lewis bases.
C)   they are ions.
D)   they are electron pair acceptors.
E)   they are Brønsted-Lowry acids.F) A) and C)
G) All of the above

Question 14

Which of the following should be the strongest reducing agent?

Accepted Answer

A)   Fe
B)   Ru
C)   Os
D)   Re
E)   CuF) B) and E)
G) All of the above

Question 15

Mercury(II)  compounds are assimilated into the food chain because

Accepted Answer

A)   they are ionic substances that are concentrated in cell tissue.
B)   they complex with compounds in the blood which carries them to the muscle tissue of organisms.
C)   they are incorporated into bone structure.
D)   they are very soluble in water and easily ingested.
E)   they are nonpolar substances that are concentrated in fatty tissues as they move up the food chain.F) A) and B)
G) None of the above

Question 16

All atoms of the first transition series of elements have the ground state electronic configuration [Ar]4s23dx, where x is an integer from 1 to 10.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following ions is least likely to form colored compounds?

Accepted Answer

A)   Mn2+
B)   Cr5+
C)   Sc3+
D)   Fe3+
E)   Co2+F) B) and C)
G) C) and D)

Question 18

Of the 3d transition series of elements, scandium has the greatest atomic radius.

Accepted Answer

A) True 
 B)False

Question 19

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 B)
G) D) and E)

Question 20

The Cu2+ ion has 1 unpaired electron.

Accepted Answer

A) True 
 B)False

Exam 23: The Transition Elements and Their Coordination Compounds

Which of the following will be the strongest oxidizing agent?

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Which of the following ions is least likely to form colored compounds?

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Write the formula for sodium tetracyanonickelate(II) .

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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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The ground state electronic configuration of Cr2+ is:

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What is the highest possible oxidation state for molybdenum, Mo?

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According to Valence Bond theory, in the square planar Ni(CN) 42¯ complex ion, the orbital hybridization pattern is:

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In the spectrochemical series, which one of the following ligands has the strongest field?

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Which of the following should be the strongest reducing agent?

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The most common oxidation state for ions of the transition elements is:

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Mercury(II) compounds are assimilated into the food chain because

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Which of the following ions is most likely to form colored compounds?

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All atoms of the first transition series of elements have the ground state electronic configuration [Ar]4s23dx, where x is an integer from 1 to 10.

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In the formation of a transition metal complex, the central metal atom or ion acts as

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How many unpaired electrons are there in the Fe3+ ion?

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

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Of the 3d transition series of elements, scandium has the greatest atomic radius.

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Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which one, if any, of the following is a pair of optical isomers?

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The Cu2+ ion has 1 unpaired electron.

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A characteristic of ligands is that

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The ground state electronic configuration of Cr²⁺ is:

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According to Valence Bond theory, in the square planar Ni(CN) ₄²¯ complex ion, the orbital hybridization pattern is:

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All atoms of the first transition series of elements have the ground state electronic configuration [Ar]4s²3d^x, where x is an integer from 1 to 10.

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How many unpaired electrons are there in the Fe³⁺ ion?

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Which of the following octahedral complexes should have the largest crystal field splitting energy, $\Delta$ ?

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The Cu²⁺ ion has 1 unpaired electron.

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