Question 1

Conductivity experiments indicate that dichlorotetraamine-palladium (IV)chloride is composed of 3 moles of ions per mole of compound.However,only 2 moles of AgCl per mole of compound are precipitated rapidly when silver nitrate solution is added to a solution of the palladium compound.What is the probable structure of the complex ion?
A)octahedral
B)square planar
C)tetrahedral
D)linear
E)trigonal planar

Accepted Answer

The precipitation reaction suggests that two chloride ions are readily available for reaction with silver ions. This is consistent with a square planar structure where two chloride ions are adjacent to each other in the plane of the molecule, while the third chloride ion is situated on the perpendicular axis, which makes it less accessible for reaction. The conductivity experiment indicates the presence of three moles of ions, which is also consistent with a square planar structure, where there are four ligands around the central palladium ion, resulting in four ions in solution.

Question 2

What is the correct IUPAC name for K₃[Co(NO₂)₆]? A)tripotassiumhexanitritocobalt(0) B)tripotassiumhexanitritocobalt(III) C)potassium hexanitritocobaltate(III) D)potassium hexanitritocobalt(III) E)potassium hexanitratocobalt(III)

Accepted Answer

The compound contains Co(III) ion, which is coordinated to six nitrite anions. The anionic complex has three potassium ions associated with it. Therefore, the correct IUPAC name for the compound is potassium hexanitritocobaltate(III).

Question 3

Give the correct name for [Fe(H₂O)₄(OH)₂]⁺. A)diaquotetrahydroxoiron(III) B)tetrahydroxodiaquoferrate(III) C)hydrated iron hydroxide D)tetrawaterdihydroxoiron(III) E)tetraaquadihydroxoiron(III)

Accepted Answer

The complex ion [Fe(H2O)4(OH)2]+ is named as tetraaquadihydroxoiron(III), where "tetraaqua" indicates four water molecules, "dihydroxo" indicates two hydroxide ions, and "iron(III)" indicates the oxidation state of iron.

Question 4

Give the correct name for [Fe(CN)₆]^4-. A)hexayanoiron(II) B)iron hexacyanide C)hexacyanoferrate(II) D)hexacyanide iron(II) E)hexacyanoferrate(III)

Accepted Answer

The formula given in the question is for a complex ion containing iron and cyanide ligands. The prefix "hexa-" indicates that there are six cyanide ligands, and the suffix "-ate" indicates that the complex ion has a negative charge. The Roman numerals in parentheses after the metal name indicate the oxidation state of the metal ion, which in this case is +2. Therefore, the correct name for the complex ion is hexacyanoferrate(II).

Question 5

The two different compounds [Cu(NH₃)₄][Fe(CN)₄(H₂O)₂] and [Cu(CN)₄]Fe(NH₃)4(H₂O)₂] are examples of ________. A)optical isomers B)linkage isomers C)ionization isomers D)geometric isomers E)coordination isomers

Accepted Answer

These two compounds have the same atoms, but the ligands are bonded differently. In the first compound, the copper ion is bonded to the bidentate ligand NH₃ and the Fe ion is bonded to the monodentate ligand cyanide. In the second compound, the copper ion is bonded to cyanide and the Fe ion is bonded to four molecules of NH₃. Therefore, these compounds are examples of coordination isomers.

Question 6

Give the correct name for [Ni(NH₃)₄]²⁺. A)tetraamminonickelate(II) B)nickel amine C)tetraamminenickel(II) D)nickel tetraamine E)tetraamminonickel(IV)

Accepted Answer

The complex is a nickel complex with four ammine ligands, which makes it a tetraamminenickel(II) complex. The other answer choices do not accurately represent the composition or oxidation state of the complex.

Question 7

A compound has the empirical formula CoCl₃ ∙ 5NH₃.One mole of it yields three moles of silver chloride when treated with silver nitrate.Ammonia is not removed by treatment with concentrated sulfuric acid.A reasonable formula for the compound is ________. A)[Co(NH₃)₅]Cl₃ B)CoCl₃ ∙ 5NH₃ C)[Co(NH₃)₄Cl]Cl₂ ∙ NH₃ D)[Co(NH₃)₅Cl]Cl₂ E)[Co(NH₃)₄Cl₂]Cl ∙ NH₃

Accepted Answer

The compound yields three moles of silver chloride when treated with silver nitrate, which indicates that there are three chloride ions outside the coordination sphere. The empirical formula of the compound is CoCl3 · 5NH3, which suggests that there are five ammonia molecules coordinated to the cobalt ion. The fact that ammonia is not removed by treatment with concentrated sulfuric acid indicates that the ammonia molecules are strongly bound to the cobalt ion. Therefore, the reasonable formula for the compound is [Co(NH3)5]Cl3.

Question 8

The difference between coordination of Co²⁺ with NO₂^- by an oxygen-cobalt bonding compared to a nitrogen-cobalt bonding results in ________. A)coordination isomers B)geometric isomers C)ionization isomers D)linkage isomers E)optical isomers

Accepted Answer

The difference in coordination between the two compounds is due to the different ligands attached to the central cobalt atom. Specifically, the oxygen-cobalt bonding in Co²⁺ results in a linkage isomer, while the nitrogen-cobalt bonding in NO₂^- results in a different linkage isomer. Therefore, the correct answer is D, linkage isomers.

Question 9

Molecules which are nonsuperimposable mirror images of each other are called ________.
A)achiralomers
B)enantiomers
C)diastereomers
D)cis/trans isomers
E)geometers

Accepted Answer

The definition given describes enantiomers, which are chirally opposed and have opposite configurations at every chiral center. A is incorrect as achiralomers do not exist. C refers to stereoisomers that are not mirror images of each other. D refers to isomers with different arrangements around a double bond, while E is not a recognized term in organic chemistry.

Question 10

Isomers such as the two forms of the ion [Co(NH₃)₂Cl₄]^- that differ only in the way the atoms are oriented in space are called,in general ________. A)ionization isomers B)crystal field isomers C)hybridization isomers D)optical isomers E)cis-trans isomers

Accepted Answer

Isomers that differ only in the spatial arrangement of atoms, such as the two forms of [Co(NH3)2Cl4]-, are called cis-trans isomers.

Question 11

Give the correct name for [Al(H₂O)₄]³⁺. A)hydrated aluminum B)aluminum hydrate C)tetraaquoaluminate(VI) D)tetraaquaaluminum(III) E)tetrawateraluminum(IV)

Accepted Answer

The complex compound contains aluminum in the +3 oxidation state and four water molecules as ligands. Therefore, the correct name will be tetraaquaaluminum(III) and not hydrated aluminum or aluminum hydrate. The other options (tetraaquoaluminate(VI) and tetrawateraluminum(IV)) do not follow the correct naming conventions for this compound.

Question 12

Write the correct formula for tetrachloroplatinate (II)ion. A)[PtCl₄]^2- B)PtCl₃Cl C)[Pt₄Cl]^- D)[PtCl₃]^-Cl^- E)[PtCl₂]₄²⁺

Accepted Answer

The correct formula for tetrachloroplatinate(II) ion is [PtCl4]2-. This indicates a platinum ion in the +2 oxidation state bonded to four chloride ions, forming a complex ion with a 2- charge.

Question 13

Give the correct name for [Fe(CO)₄]. A)tetracarbonyliron(0) B)iron carbon monoxide C)carbonylferrate(IV) D)tetracarbonylferrate(0) E)iron carbonyl

Accepted Answer

The correct name for [Fe(CO)4] is tetracarbonyliron(0), indicating that there are four carbonyl (CO) ligands attached to an iron center, and the overall charge of the complex is neutral (0).

Question 14

The correct name for [Ag(NH₃)₂]⁺ is ________. A)silver amide B)diamminesilver(I)ion C)silver ammoniate D)silver nitride E)silver(I)diammine ion

Accepted Answer

The complex ion [Ag(NH3)2]+ is named as diamminesilver(I) ion, where "diammine" indicates two ammonia ligands and "silver(I)" specifies the oxidation state of silver.

Question 15

What is the correct IUPAC name for [Co(NH₃)₆]²⁺? A)hexammoniacobaltate(II) B)hexaamminecobaltate(II) C)hexammoniacobalt(II) D)hexaamminecobalt(II) E)hexaamminecobaltium(II)

Accepted Answer

The complex contains one cobalt ion bonded to six ammonia molecules, giving it the prefix "hexaammine." The oxidization state of the cobalt ion is 2, giving it the suffix "cobaltate(II)." This is the proper naming convention according to IUPAC rules.

Question 16

Give the correct name for [AuF₄]^-. A)gold fluoride B)tetrafluoroaurate(III) C)gold tetrafluoride D)tetrafluorogold(III) E)tetrafluoride gold

Accepted Answer

The correct name for [AuF4]^- is tetrafluoroaurate(III). The prefix "tetra-" indicates four fluoride ions, "aurate" is used for gold in anionic complexes, and (III) indicates the oxidation state of gold.

Question 17

The correct formula of triamminediaquachlorocobalt (III)iodide is ________. A)[Co(NH₃)₂(H₂O)₃Cl]I₂ B)[Co(NH₃)₃(H₂O)₂Cl]I₃ C)[Co(NH₃)₃(H₂O)₂Cl]I₂ D)[Co(NH₃)₃(H₂O)₂Cl]I E)[Co(NH₃)₃(H₂O)₂I]Cl₂

Accepted Answer

The prefix "tri" indicates three, meaning there are three ammonia molecules present. The suffix "-aqua" indicates that two water molecules are present. The complex ion has a negative charge, which is balanced by the iodide ion (I-). The oxidation state of cobalt (III) is indicated by the Roman numeral III in parentheses in the name, which means it has a charge of +3. The presence of one chloro ligand is also indicated in the name. The correct formula can be written as [Co(NH3)3(H2O)2Cl]I. Choice C is the only option that matches this formula.

Question 18

Which of the following complexes has no geometric isomers? A)[Pt(NH₃)₄F₂] B)[Pt(NH₃)F₅]^-3 C)[Co(NH₃)₄F₂]⁺ D)[Co(NH₃)₃F₃] E)[Co(NH₃)₂F₄]^-

Accepted Answer

The complex [Pt(NH3)F5]^-3 is a square pyramidal or trigonal bipyramidal complex, which does not exhibit geometric isomerism due to its symmetry.

Question 19

What is the correct name of the following ion: [Zn(CN)₄]^2- A)zinc quadracyanide B)tetracyanozincate(II) C)zinc cyanide D)tetracyanozinc(II) E)cyanozinc(IV)

Accepted Answer

The ion is a coordination complex consisting of a central zinc ion coordinated to four cyanide ligands. The overall charge of the ion is -2, indicating that the zinc ion has a +2 charge. The name of this ion follows the format of "metal name ligand name" with an -ate ending for the ligand name. Therefore, the correct name for this ion is tetracyanozincate(II).

Question 20

What is the correct IUPAC name for [AuCl₄(H₂O)₂]^-? A)diaquatetrachloroaurate(III) B)diaquatetrachloroaurate(I) C)diaquatetrachlorogold(III) D)diaquatetrachlorogold(I) E)diaquatetrachlorogoldate(III)

Accepted Answer

The correct IUPAC name for [AuCl₄(H₂O)₂]^- is diaquatetrachloroaurate(III) because the complex ion has a central gold(III) ion, four chloride ligands, and two water ligands. The name is derived from the prefixes "diaqua" (for two water ligands), "tetrachloro" (for four chloride ligands), "aurate" (for the gold ion), and "(III)" to indicate the oxidation state of the gold ion.

Quiz 24: Complex Ions and Coordination Compounds

What is the correct IUPAC name for K₃[Co(NO₂) ₆]?

Give the correct name for [Fe(H₂O) ₄(OH) ₂]⁺.

Give the correct name for [Fe(CN) ₆]^4-.

The two different compounds [Cu(NH₃) ₄][Fe(CN) ₄(H₂O) ₂] and [Cu(CN) ₄]Fe(NH₃) 4(H₂O) ₂] are examples of ________.

Give the correct name for [Ni(NH₃) ₄]²⁺.

A compound has the empirical formula CoCl₃ ∙ 5NH₃.One mole of it yields three moles of silver chloride when treated with silver nitrate.Ammonia is not removed by treatment with concentrated sulfuric acid.A reasonable formula for the compound is ________.

The difference between coordination of Co²⁺ with NO₂^- by an oxygen-cobalt bonding compared to a nitrogen-cobalt bonding results in ________.

Molecules which are nonsuperimposable mirror images of each other are called ________.

Isomers such as the two forms of the ion [Co(NH₃) ₂Cl₄]^- that differ only in the way the atoms are oriented in space are called,in general ________.

Give the correct name for [Al(H₂O) ₄]³⁺.

Write the correct formula for tetrachloroplatinate (II) ion.

Give the correct name for [Fe(CO) ₄].

The correct name for [Ag(NH₃) ₂]⁺ is ________.

What is the correct IUPAC name for [Co(NH₃) ₆]²⁺?

Give the correct name for [AuF₄]^-.

The correct formula of triamminediaquachlorocobalt (III) iodide is ________.

Which of the following complexes has no geometric isomers?

What is the correct name of the following ion: [Zn(CN) ₄]^2-

What is the correct IUPAC name for [AuCl₄(H₂O) ₂]^-?

Quiz 24: Complex Ions and Coordination Compounds

What is the correct IUPAC name for K3[Co(NO2) 6]?

Give the correct name for [Fe(H2O) 4(OH) 2]+.

Give the correct name for [Fe(CN) 6]4-.

The two different compounds [Cu(NH3) 4][Fe(CN) 4(H2O) 2] and [Cu(CN) 4]Fe(NH3) 4(H2O) 2] are examples of ________.

Give the correct name for [Ni(NH3) 4]2+.

A compound has the empirical formula CoCl3 ∙ 5NH3.One mole of it yields three moles of silver chloride when treated with silver nitrate.Ammonia is not removed by treatment with concentrated sulfuric acid.A reasonable formula for the compound is ________.

The difference between coordination of Co2+ with NO2- by an oxygen-cobalt bonding compared to a nitrogen-cobalt bonding results in ________.