Question 1

The lanthanide contraction results because

Accepted Answer

A) the shielding effect of the d-electrons is less than that of the f-electrons. 
B) the shielding effect of the d-electrons is greater than that of the f-electrons. 
C) of the poor shielding effect of the f-electrons and the higher nuclear charge. 
D) the d-electrons shield the f-electrons from the nucleus. 
E) f-electrons interact more strongly with each other than d-electrons. 
A) the shielding effect of the d-electrons is less than that of the f-electrons. 
B) the shielding effect of the d-electrons is greater than that of the f-electrons. 
C) of the poor shielding effect of the f-electrons and the higher nuclear charge. 
D) the d-electrons shield the f-electrons from the nucleus. 
E) f-electrons interact more strongly with each other than d-electrons.

Question 2

Which of the following complexes is (are)chiral?

Accepted Answer

A) 4 
B) 3 
C) 1 and 3 
D) 2 
E) 1 and 2 
A) 4 
B) 3 
C) 1 and 3 
D) 2 
E) 1 and 2

Question 3

For the complex ion [Co(en)(NH3)2(OH2)Cl]2+,there are four possible geometric isomers.How many of these geometric isomers are optically active?

Accepted Answer

A) none 
B) 3 
C) all of them 
D) 1 
E) 2 
A) none 
B) 3 
C) all of them 
D) 1 
E) 2

Question 4

In the complex [Fe(CN)6]4-,

Accepted Answer

A) iron is a Lewis acid and cyanide is a Lewis base. 
B) Cyanide is a Lewis acid. 
C) iron has an oxidation number of +3. 
D) Cyanide has an oxidation number of -2. 
A) iron is a Lewis acid and cyanide is a Lewis base. 
B) Cyanide is a Lewis acid. 
C) iron has an oxidation number of +3. 
D) Cyanide has an oxidation number of -2.

Question 5

The compound Co(en)2(NO2)2Cl has been prepared in a number of isomeric forms.All the forms have the nitrite ion coordinated trough the nitrogen atom.Draw the structure of each isomeric form.
a)One form is optically inactive and does not react with AgNO3 or en.
b)A second form reacts with AgNO3 but not with en and is also optically inactive.
c)A third form is optically active and reacts with both AgNO3 and en.

Accepted Answer

(a)trans-chloronitrobis(ethyle

Question 6

Complexes with coordination number 4 are either tetrahedral or octahedral.

Accepted Answer

A) True 
 B)False

Question 7

For the complex ion [Co(NCO)2(PH3)4]+,how many different isomers of the complex can exist?

Accepted Answer

A) 8 
B) 6 
C) 4 
D) 3 
E) 2 
A) 8 
B) 6 
C) 4 
D) 3 
E) 2

Question 8

One mole of pentaamminechlorocobalt(III)chloride dissolves in water to give _____ moles of ions.

Accepted Answer

The answer of One mole of pentaamminechlorocobalt(III)chloride dissolves in water...

Question 9

The complex CoCl42- absorbs light at approximately ____________ nm and its color is ____________.

Accepted Answer

600-700; v

Question 10

Which of the following complexes is likely to have an absorbance maximum at 305 nm?

Accepted Answer

A) Fe(CN)64- 
B) Ti(OH2)63+ 
C) Fe(OH2)63+ 
D) Co(NH3)63+ 
A) Fe(CN)64- 
B) Ti(OH2)63+ 
C) Fe(OH2)63+ 
D) Co(NH3)63+

Question 11

What is the name of the complex [Cr(en)2(OH2)Cl]Cl2?

Accepted Answer

A) diethylenediaminebis(aquachloro)chromium(III)chloride 
B) Aquachlorobis(ethylenediamine)chromium(III)chloride 
C) Chloroaquabis(ethylenediamine)chromate(III)chloride 
D) Aquachlorobis(ethylenediamine)chromium(II)dichloride 
E) Aquachloridebis(ethylenediamine)chromium(III)chloride 
A) diethylenediaminebis(aquachloro)chromium(III)chloride 
B) Aquachlorobis(ethylenediamine)chromium(III)chloride 
C) Chloroaquabis(ethylenediamine)chromate(III)chloride 
D) Aquachlorobis(ethylenediamine)chromium(II)dichloride 
E) Aquachloridebis(ethylenediamine)chromium(III)chloride

Question 12

What is the name of the complex Na[Co(NH3)3Cl3]?

Accepted Answer

A) Sodium triamminetrichlorocobaltate(II) 
B) Sodium triamminetrichlorocobalt(III) 
C) Sodium tris(aminechloro)cobaltate(II) 
D) Sodium triamminetrichlorocobalt(II) 
E) Sodium trichlorotriamminecobalt(III) 
A) Sodium triamminetrichlorocobaltate(II) 
B) Sodium triamminetrichlorocobalt(III) 
C) Sodium tris(aminechloro)cobaltate(II) 
D) Sodium triamminetrichlorocobalt(II) 
E) Sodium trichlorotriamminecobalt(III)

Question 13

The atomic radii of the Period 6 d-metals are

Accepted Answer

A) smaller than expected,and about the same as the Period 5 d-metals. 
B) about the same as the lanthanides. 
C) larger than the atomic radii of the Period 5 d-metals. 
D) about the same as the Period 4 d-metals. 
E) large because of the lanthanide contraction. 
A) smaller than expected,and about the same as the Period 5 d-metals. 
B) about the same as the lanthanides. 
C) larger than the atomic radii of the Period 5 d-metals. 
D) about the same as the Period 4 d-metals. 
E) large because of the lanthanide contraction.

Question 14

Both Cu2+(aq)and Zn2+(aq)are colorless.

Accepted Answer

A) True 
 B)False

The lanthanide contraction results because

Which of the following complexes is (are)chiral?

For the complex ion [Co(en)(NH₃)₂(OH₂)Cl]²⁺,there are four possible geometric isomers.How many of these geometric isomers are optically active?

In the complex [Fe(CN)₆]^4-,

Complexes with coordination number 4 are either tetrahedral or octahedral.

For the complex ion [Co(NCO)₂(PH₃)₄]⁺,how many different isomers of the complex can exist?

One mole of pentaamminechlorocobalt(III)chloride dissolves in water to give _____ moles of ions.

The complex CoCl₄^2- absorbs light at approximately nm and its color is .

Which of the following complexes is likely to have an absorbance maximum at 305 nm?

What is the name of the complex [Cr(en)₂(OH₂)Cl]Cl₂?

What is the name of the complex Na[Co(NH₃)₃Cl₃]?

The atomic radii of the Period 6 d-metals are

Both Cu²⁺(aq)and Zn²⁺(aq)are colorless.

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Exam 17: The Elements: The D Block

The lanthanide contraction results because

Which of the following complexes is (are)chiral?

For the complex ion [Co(en)(NH3)2(OH2)Cl]2+,there are four possible geometric isomers.How many of these geometric isomers are optically active?

In the complex [Fe(CN)6]4-,

Complexes with coordination number 4 are either tetrahedral or octahedral.

For the complex ion [Co(NCO)2(PH3)4]+,how many different isomers of the complex can exist?

One mole of pentaamminechlorocobalt(III)chloride dissolves in water to give _____ moles of ions.

The complex CoCl42- absorbs light at approximately ____________ nm and its color is ____________.

Which of the following complexes is likely to have an absorbance maximum at 305 nm?

What is the name of the complex [Cr(en)2(OH2)Cl]Cl2?

What is the name of the complex Na[Co(NH3)3Cl3]?

The atomic radii of the Period 6 d-metals are

Both Cu2+(aq)and Zn2+(aq)are colorless.

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

The Properties of Gases

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

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For the complex ion [Co(en)(NH₃)₂(OH₂)Cl]²⁺,there are four possible geometric isomers.How many of these geometric isomers are optically active?

In the complex [Fe(CN)₆]^4-,

For the complex ion [Co(NCO)₂(PH₃)₄]⁺,how many different isomers of the complex can exist?

The complex CoCl₄^2- absorbs light at approximately nm and its color is .

What is the name of the complex [Cr(en)₂(OH₂)Cl]Cl₂?

What is the name of the complex Na[Co(NH₃)₃Cl₃]?

Both Cu²⁺(aq)and Zn²⁺(aq)are colorless.