Question 1

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 ________.

Accepted Answer

The answer of A compound has the empirical formula CoCl₃...

Question 2

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

Accepted Answer

These compounds are examples of coordination isomers, which have the same chemical formula but differ in the way the ligands are coordinated to the central metal ion. In these two compounds, the Cu and Fe ions are coordinated to different ligands, resulting in different coordination isomers.

Question 3

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

Accepted Answer

The correct IUPAC name for [AuCl₄(H₂O)₂]^- is tetrachlorodiaquaaurate(III). This is because the complex ion contains a gold(III) ion, which is indicated by the Roman numeral III in the name. The four chloride ions and two water molecules are ligands, and they are named in alphabetical order.

Question 4

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 ________.

Accepted Answer

The two forms of the ion [Co(NH3)2Cl4]- that differ only in the spatial orientation of the ligands are called cis-trans isomers, which is a type of geometrical isomerism.

Question 5

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

Accepted Answer

The correct IUPAC name is "hexaamminecobalt(II)" because the complex is a cation, and "ammine" is the correct ligand name for NH3. The oxidation state of cobalt is indicated by (II).

Question 6

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

Accepted Answer

The correct formula of triamminediaquachlorocobalt (III) iodide is [Co(NH3)3(H2O)2Cl]I. The formula has three ammine (NH3) ligands, two aqua (H2O) ligands, one chloride (Cl) ligand, and one iodide (I) ligand. Choice C is the only option with this composition.

Question 7

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

Accepted Answer

According to the IUPAC rules, the complex ion [Co(NO₂)₆)] should be named as nitrito-S'-(nitroso-S'')-S-ethyldithiocobaltate(III). The entire complex is then enclosed in square brackets and the number of ligands is indicated by a prefix (hexa, in this case) before the ligand name (nitritocobaltate). Finally, the charge on the complex is indicated in parentheses (III, in this case). The counterions (potassium) are named as such and the number of counterions is indicated by a prefix (tri, in this case) before the name of the counterion. Therefore, the correct name for K₃[Co(NO₂)₆] is potassium hexanitritocobaltate(III).

Question 8

Write the correct formula for tetrachloroplatinate (II) ion.

Accepted Answer

The tetrachloroplatinate (II) ion consists of a platinum ion coordinated with four chloride ions, resulting in a 2- charge.

Question 9

Give the correct name for [Fe(CO)4].

Accepted Answer

The complex [Fe(CO)4] is named tetracarbonyliron(0) because it consists of four carbonyl (CO) ligands bonded to an iron atom in the zero oxidation state.

Question 10

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

Accepted Answer

The complex ion [Fe(H2O)4(OH)2]+ is named by first identifying the ligands and their quantities: four water molecules (aqua) and two hydroxide ions (hydroxo). The metal, iron, is in the +3 oxidation state, indicated by the Roman numeral III. Therefore, the correct name is tetraaquadihydroxoiron(III).

Question 11

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

Accepted Answer

The complex contains a nickel(II) ion coordinated to four ammonia (ammine) ligands in a tetrahedral arrangement. The correct name for this coordination complex is tetraamminenickel(II). The other choices either have incorrect naming conventions or do not accurately describe the composition of the complex.

Question 12

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

Accepted Answer

The different coordination modes involving oxygen-cobalt and nitrogen-cobalt bondings result in different isomers, specifically linkage isomers. Therefore, the correct answer is D.

Question 13

Which of the following complexes has no geometric isomers?

Accepted Answer

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

Question 14

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?

Accepted Answer

The fact that only 2 moles of AgCl per mole of compound are precipitated suggests that there are only 2 chloride ions available for reaction. This could only happen if the other two chloride ions are coordinated to the central palladium ion, leaving only two available for reaction with silver ions. The most likely coordination number for palladium in this complex is 4 or 6, and since square planar is the most common structure for Pd(IV) complexes, the probable structure is square planar.

Question 15

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

Accepted Answer

The correct name for this ion is tetracyanozincate(II) because it consists of a complex ion with four cyanide ligands bonded to a zinc ion with a 2- charge. The prefix "tetra" is used to indicate the presence of four cyanide ligands, and the suffix "-ate" indicates that this is a negatively charged complex ion. Finally, the Roman numeral (II) indicates the oxidation state of the zinc ion.

Question 16

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

Accepted Answer

The complex has a central aluminum atom and four water molecules surrounding it, hence the prefix "tetraaqua". The Roman numeral (III) in the name indicates the oxidation state of aluminum.

Question 17

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

Accepted Answer

The correct naming convention for coordination compounds is to start with the ligands (in alphabetical order) followed by the metal ion in Roman numerals indicating its charge. In this case, the ligand is hexacyanide, which is a negatively charged complex ion. The metal ion is iron, which is in the +2 oxidation state. Therefore, the correct name is hexacyanoferrate(II) (Choice C).

Question 18

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

Accepted Answer

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

Question 19

Give the correct name for [AuF4]-.

Accepted Answer

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

Question 20

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

Accepted Answer

Nonsuperimposable mirror images are enantiomers.

Quiz 24: Complex Ions and Coordination Compounds

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

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

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 ________.

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

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

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

Write the correct formula for tetrachloroplatinate (II) ion.

Give the correct name for [Fe(CO) 4].

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

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

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

Which of the following complexes has no geometric isomers?

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

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

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

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

Give the correct name for [AuF4]-.

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

Quiz 24: Complex Ions and Coordination Compounds

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

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

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 ________.

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

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

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

Write the correct formula for tetrachloroplatinate (II) ion.

Give the correct name for [Fe(CO) 4].

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

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

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

Which of the following complexes has no geometric isomers?

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

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

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

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

Give the correct name for [AuF4]-.

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

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

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

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 ________.

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

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 [Ni(NH₃) ₄]²⁺.

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

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

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